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易错点8 非谓语动词之动词不定式
在中考语法项目中，主要考查动词不定式作宾语、宾语补足语、目的状语。动词不定式由“to+动词原形” 构成，有时to省略，直接由动词原形构成。否定式由“not to+动词原形” 构成。
如：We decided to go on hiking though we were tired. 虽然我们很累，但是我们决定继续远足。
The girl tried not to wake up her mother. 这女孩尽量不吵醒她妈妈。
动词不定式作宾语
（1）接不定式作宾语的动词（“动词+to do” 结构）常见的有：
learn 学会 plan 计划 decide 决定 try 尽力 choose 选择 agree 同意
refuse 拒绝 pretend 假装 offer 主动 would like / want 想要 expect 期望
hope / wish 希望 promise 承诺 afford 负担得起 prefer 喜欢
help 帮助(help to do / help do) like 喜欢(like to do / doing)
continue 继续(continue to do / doing) begin / start 开始(begin / start to do / doing)
如：I would like to have a sandwich. 我想要吃一个三明治。
（2）动词不定式作宾语，置句末，前面用it指代不定式，it是形式宾语。
如：We found it difficult to understand what you said. 我们发现很难理解你所说的话。
（3）有的动词在不定式前可加上疑问词（who，what，which等）作宾语（即“动词+疑问词+to do” 结构），常见的有：show 表明、指示；know 知道；tell 告诉；teach 教；learn 学习；decide 决定。
如：Larry didn’t know how to tell her the bad news. 拉里不知道如何告诉她这个坏消息。
1．（2025·天津红桥·模拟预测）Many students are talking about Deep Seek, and I hope _________ it to remember English words.
A．use B．used C．using D．to use
2．（2025·甘肃·模拟预测）—Have you considered going to Paris to watch the Olympics
—No, I’d love ________ at home to watch it.
A．to stay B．staying C．stay D．stayed
3．（24-25九年级下·天津静海·开学考试）We don’t understand why you refused ________ our teacher’s question.
A．answering B．answer C．answered D．to answer
4．（24-25九年级·安徽芜湖·自主招生）Chinese people find ________ our duty ________ develop African countries along the Belt and Road (一带一路).
A．it; to help B．this; help C．that; to help D．its; help
5．（2024·湖北黄石·模拟预测）Students should learn how ________ problems.
A．to solve B．solve C．solving D．solved
6．（24-25九年级下·江苏宿迁·开学考试）I think _________ important _________ English every morning.
A．that; keep reading B．it’s; keeping reading
C．that; to keep read D．it; to keep reading
7．（2025·上海宝山·模拟预测）The lights are still on in the lab. Please remember ________ before leaving.
A．turning them off B．to turn them off C．turning it off D．to turn it off
8．（2025·北京·模拟预测）—Look! The light in the lab is still on.
—Oh, I forgot ______ it off before leaving.
A．to turn B．turning C．turn D．turned
9．（2024·吉林长春·模拟预测）To keep safe, everyone is supposed ________ a seat belt in the car.
A．wear B．to wear C．wearing D．wore
10．（2024·北京西城·模拟预测）I don’t want ________ some shopping this afternoon.
A．to do B．doing C．did D．do
动词不定式作宾语补足语
（1）接不定式作宾语补足语的动词（动词+sb.+to do结构，否定式“动词+sb.+not to do” ）常见的有：
tell 告诉 ask 请 order 命令 warn 警告 teach 教 want 想要
wish 希望 expect 期望 encourage 鼓励 allow 允许 invite 邀请 advise 建议
require 要求 force 强迫
如：Do you want me to find out the phone number 你想要我找出那个电话号码吗？
（2）有些及物动词，接不定式作宾语补足语时（动词+sb.+do ），要省略to。这类及物动词常见的有：
let 让 make 使 have 使 see 看见 watch 注视 hear 听到
notice 注意到 feel 感觉起来
被动语态中要还原to，如 make sb. do被动语态变为 sb. be made to do。
如：I saw him read in the library yesterday. 我昨天看到他在图书馆阅读
He was seen to read in the library yesterday. 他被看见昨天在图书馆阅读。
11．（2025·江苏扬州·一模）—As the High School Entrance exam is coming, students are under great stress.
—We teachers should encourage them ______ nervous, and give them some advice on ______ the stress.
A．not to be; reducing B．not be; to reduce
C．not to be; to reduce D．not be; reducing
12．（24-25九年级下·上海·阶段练习）The rich income enables our family ________ a happy life.
A．to live B．living C．live D．lived
13．（2025·吉林·模拟预测）The teacher asked the students ________ loudly in the library.
A．not to talk B．to not talk C．don’t talk D．not talking
14．（2024·广东珠海·模拟预测）—When can I go out to play football, Mum
—Finish your homework first, or I won’t let you ________.
A．to go out B．go out C．going out D．will go out
15．（2025·吉林·模拟预测）My mother often tells me ________ too much junk food.
A．eat B．not eat C．to eat D．not to eat
16．（2025·吉林·模拟预测）The students were made ________ the text ten times after class.
A．copy B．to copy C．copying D．copied
17．（24-25九年级下·云南昆明·开学考试）Sad movies make me ________.
A．cry B．crying C．to cry D．cried
18．（24-25九年级下·黑龙江哈尔滨·开学考试）Our English teacher advises us, especially those who are weak in English, ________ English every morning.
A．reading B．read C．to read
19．（2025·安徽·模拟预测）The new law requires people ________ household garbage into four categories.
A．sort B．to sort C．sorting D．sorted
20．（2024·福建泉州·模拟预测）Nowadays, many tourist attractions allow visitors ________ free tickets by reciting poems.
A．getting B．get C．to get
3. 动词不定式作目的状语
不定式作目的状语，可放在句首或句末。to表示目的、为了。
如：To learn math well, you must do more exercises. 为了学好数学，你必须多做练习。
We came here to ask you for help. 我们来这是为了向你寻求帮助。
21．（2025·江苏宿迁·一模）As middle school students, we should do everything we can ________ the environment.
A．to protect B．protecting C．protect D．protected
22．（2024·甘肃武威·二模）I prefer to have ______ one of the two skirts ______ some money for a dictionary.
A．the cheapest, to save B．a cheaper, to saving C．a cheaper, to save D．the cheaper, to save
23．（2024·吉林·模拟预测）We’d better eat more healthy food and do more exercise ________ healthy.
A．to keep B．keep C．keeping
24．（2025·福建泉州·一模）Teenagers should reduce their screen time _______ their eyes.
A．protect B．to protect C．protecting
25．（2025·吉林长春·模拟预测）We should plant more trees ______ the environment.
A．protect B．protecting C．to protect D．protected
26．（2025·安徽·模拟预测）Anhui is making great efforts ________ the digital economy to boost economic development.
A．develop B．developing C．to develop D．developed
27．（2024·云南昆明·二模）________ the first bus, Eric always get up early.
A．Catch B．Catching C．Catches D．To catch
28．（24-25九年级·安徽芜湖·自主招生）They want to do what they can ________ us.
A．help B．helping C．to help D．helped
29．（24-25九年级下·吉林长春·开学考试）Many students work hard ________ their writing skills.
A．improve B．improving C．to improve D．improved
30．（2024·吉林长春·模拟预测）________ down air pollution, we should drive less and use the green transportation more.
A．Cut B．To cut C．Cutting D．Cuts
4. 不定式的常见句型
31．（2025·江西·模拟预测）—It’s interesting for us ________ games in the Central Park.
—Yes, I feel the same way.
A．to play B．playing C．play D．plays
32．（23-24九年级下·全国·课堂例题）It took us two hours and a half ________ to Hainan Island.
A．fly B．to fly C．flying D．flies
33．（24-25九年级下·江苏南通·阶段练习）It’s said that the water in the river will be ________ for us ________.
A．too clean; to drink B．enough clean; to drink
C．so clean; to drink D．clean enough; to drink
34．（24-25九年级上·四川遂宁·开学考试）He thinks it’s ________ difficult for him ________ deal with the problem by himself.
A．too; to B．so; that C．enough; to D．such; that
35．（2024·甘肃陇南·三模）Don’t stay up late. It’s time ________ to bed.
A．go B．went C．going D．to go
36．（2025·广东江门·二模）Some students find ________ very hard ________ in the early morning.
A．is; to get up B．that; get up C．it; to get up D．it’s; gets up
37．（2023·吉林长春·二模）I think ________ not difficult ________ English every morning.
A．that; keep reading B．it’s; to keep reading C．that; to keep read D．it; to keep to read
38．（2024·云南楚雄·三模）—It’s kind of you ________ your time for the community clean up event.
—We are glad to help.
A．volunteer B．to volunteer C．volunteering D．volunteered
39．（21-22九年级上·广东深圳·开学考试）Thanks for the offer. It is very nice ________ you ________ of me.
A．of; to think B．for; to think C．of; thinking D．for; thinking
40．（24-25九年级上·全国·课后作业）Jim was the first ________ at the finishing line and Dave was the next.
A．arrive B．arriving C．to arrive D．to arriving
41．（2024·四川·中考真题）—What are you going to do this summer vacation
—I plan ________ my cousin in Hangzhou.
A．visit B．visiting C．to visit D．visited
42．（2024·海南·中考真题）In China, family members get together ________ the Mid-Autumn Festival.
A．to celebrate B．celebrate C．celebrated
43．（2024·江苏南通·中考真题）________ more about rare wild animals, I spent some time searching online last night.
A．To learn B．Learning C．Learned D．Learn
44．（2024·天津·中考真题）People may use different body language _________ the same feelings.
A．show B．to show C．showed D．shows
45．（2024·江苏扬州·中考真题）China has made great efforts ________ other countries build high-speed railways.
A．help B．to help C．helping D．helped
46．（2024·云南·中考真题）Our headmaster will invite a scientist ________ us a speech on space technology.
A．give B．given C．giving D．to give
47．（2024·四川凉山·中考真题）______ teenagers’ eyesight, experts advise them to stay away from electronic products.
A．Protect B．To protect C．Protecting
48．（2024·四川泸州·中考真题）______ healthy, we students always do morning exercises every day at school.
A．Keep B．To keep
C．Keeping D．Keeps
49．（2025·安徽·模拟预测）Many young volunteers in Anhui are working hard ________ the environment in the countryside.
A．improve B．improving C．to improve D．improved
50．（2025·安徽·模拟预测）The “State-owned+Collective” village-forest-farm cooperation plan in Anhui is a great way ________ the problems in forest management.
A．solve B．to solve C．solving D．solved
51．（2025·江苏南通·模拟预测）They contacted all the teachers they can turn to ________ their son ________ games in the dorm.
A．to prevent ; playing B．to prevent ; to play
C．preventing ; to play D．preventing ; playing
52．（2025·安徽·模拟预测）AI technology helps farmers in Anhui ________ crops more efficiently by using drones.
A．plants B．planting C．plant D．planted
53．（2025·北京·模拟预测）The teacher told us ______ waste time on video games.
A．don’t B．not to C．not D．to not
54．（2025·江苏镇江·一模）With the development of new rural communities (新农村), more and more young people go back to spend time with parents ________ them feel less lonely.
A．making B．to make C．made D．make
55．（2025·四川泸州·一模）—It’s dangerous to swim in this river.
—Yes, you are right. The government has warned people _______ in it.
A．don’t swim B．not to swim C．not swimming D．not swim
56．（2025·上海黄浦·一模）Although her schedule is busy, Lucy manages ________ her homework on time.
A．to finish B．finishing C．finish D．to finishing
57．（2025·上海闵行·一模）They happened ________ the famous Chinese tennis player at the airport yesterday.
A．saw B．seeing C．see D．to see
58．（2025·上海金山·一模）Mr. Jones expected the insurance company ________ him 300,000 dollars for the vase.
A．pay B．pays C．to pay D．not to pay
59．（2025·上海杨浦·一模）The police reminded the public ________ out for pickpockets in crowded areas.
A．look B．looked C．to look D．looking
60．（2025·上海松江·一模）Is it necessary for us ________ on clothes before buying them
A．try B．to try C．trying D．tried
61．（2025·上海虹口·一模）The Italian organizations have made a plan ________ more tourists to the landmarks.
A．attract B．to attract
C．attracting D．attracted
62．（2025·上海徐汇·一模）It is getting more difficult ________ tickets for some popular singers’ concerts.
A．buy B．buying C．to buy D．bought
63．（2025·上海普陀·一模）With only a few minutes left, they managed ________ the game around.
A．turn B．turning C．to turn D．turned
64．（2024·江苏徐州·二模）—Mr. Wu has recommended many books. Have you decided ________
—Yes. This Saturday.
A．how to borrow them B．which to read first
C．when to buy them D．where to find them
65．（2024·吉林长春·一模）_______ healthy and slim, she eats very little fried food.
A．Keep B．Keeping C．To keep D．kept
66．（24-25九年级下·吉林长春·开学考试）I’m too tired ________ farther, so let’s take a break.
A．walking B．to walk C．walk D．to walking
67．（24-25九年级下·江苏徐州·开学考试）It was brave ________ him ________ into the fire to save the child.
A．of; rushed B．for; to rush C．of; to rush D．for; rushing
68．（24-25九年级下·广东深圳·开学考试）—I don’t know what ______ about the four great classical Chinese novels.
—Why not read ______ first and then organize your own ideas
A．to write, reviews B．write, reasons
C．to write, results D．to write, rewards
69．（24-25九年级上·云南昆明·期末）As classmates, you are supposed ________ each other in your daily life.
A．help B．helping C．to help D．helped
70．（23-24九年级下·甘肃武威·开学考试）On her way home Lucy saw a thief ________ in a shop. She stopped ________ 110 at once.
A．steal; calling B．stealing; calling C．stealing; to call D．steal; to call
用所给词的正确形式填空
71．（2025·江苏无锡·一模）He couldn’t decide when (start) the project, which made his team members worried.
72．（2025·江苏无锡·一模）I think the car needs (check) every year, or it may break down on the road.
73．（2025·江苏无锡·一模）The amazing scenery in Wuxi always makes it hard for any visitors (describe).
74．（2025·甘肃定西·模拟预测）The task is too difficult. Lucy has no choice but (ask) for help.
75．（24-25九年级下·湖北武汉·阶段练习） (make) our students responsible and independent, military training (军训) has become a tradition in China.
76．（23-24九年级上·江苏无锡·期中）The little boy is so worried in the exam because he doesn’t know when (hand) in the paper.
77．（24-25九年级下·江苏泰州·阶段练习）We must try our best to stop the pollution (live) a happier life.
78．（2025九年级·山东·专题练习）Then I taught him how to use the Internet and how (play) chess online.
79．（2025九年级·湖南·专题练习）There was something wrong with the student. A psychologist was called in (help) him.
80．（2025九年级·湖南·专题练习）Mr Li is very glad (see) his students again.
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21世纪教育网(www.21cnjy.com)易错点8 非谓语动词之动词不定式
在中考语法项目中，主要考查动词不定式作宾语、宾语补足语、目的状语。动词不定式由“to+动词原形” 构成，有时to省略，直接由动词原形构成。否定式由“not to+动词原形” 构成。
如：We decided to go on hiking though we were tired. 虽然我们很累，但是我们决定继续远足。
The girl tried not to wake up her mother. 这女孩尽量不吵醒她妈妈。
动词不定式作宾语
（1）接不定式作宾语的动词（“动词+to do” 结构）常见的有：
learn 学会 plan 计划 decide 决定 try 尽力 choose 选择 agree 同意
refuse 拒绝 pretend 假装 offer 主动 would like / want 想要 expect 期望
hope / wish 希望 promise 承诺 afford 负担得起 prefer 喜欢
help 帮助(help to do / help do) like 喜欢(like to do / doing)
continue 继续(continue to do / doing) begin / start 开始(begin / start to do / doing)
如：I would like to have a sandwich. 我想要吃一个三明治。
（2）动词不定式作宾语，置句末，前面用it指代不定式，it是形式宾语。
如：We found it difficult to understand what you said. 我们发现很难理解你所说的话。
（3）有的动词在不定式前可加上疑问词（who，what，which等）作宾语（即“动词+疑问词+to do” 结构），常见的有：show 表明、指示；know 知道；tell 告诉；teach 教；learn 学习；decide 决定。
如：Larry didn’t know how to tell her the bad news. 拉里不知道如何告诉她这个坏消息。
1．（2025·天津红桥·模拟预测）Many students are talking about Deep Seek, and I hope _________ it to remember English words.
A．use B．used C．using D．to use
【答案】D
【详解】句意：很多学生都在谈论Deep Seek，我希望用它来记忆英语单词。
考查不定式作宾语。use使用，动词原形；used使用，过去分词；using使用，动名词；to use使用，不定式。hope to do意为“希望做某事”，to do作宾语。故选D。
2．（2025·甘肃·模拟预测）—Have you considered going to Paris to watch the Olympics
—No, I’d love ________ at home to watch it.
A．to stay B．staying C．stay D．stayed
【答案】A
【详解】句意：——你有考虑过去巴黎看奥运会吗？——不，我想在家看。
考查动词短语用法。would love to do sth.“想要做某事”。故选A。
3．（24-25九年级下·天津静海·开学考试）We don’t understand why you refused ________ our teacher’s question.
A．answering B．answer C．answered D．to answer
【答案】D
【详解】句意：我们不明白你为什么拒绝回答我们老师的问题。
考查非谓语动词。考查refuse to do sth.“拒绝做某事”，所以填动词不定式。故选D。
4．（24-25九年级·安徽芜湖·自主招生）Chinese people find ________ our duty ________ develop African countries along the Belt and Road (一带一路).
A．it; to help B．this; help C．that; to help D．its; help
【答案】A
【详解】句意：帮助一带一路沿线非洲国家发展是中国人民义不容辞的责任。
考查代词辨析及非谓语动词。it它；this这个；that那个；its它的。分析句子结构可知，此处为固定句式“find it+n./adj.+to do sth.”，it作形式宾语。故选A。
5．（2024·湖北黄石·模拟预测）Students should learn how ________ problems.
A．to solve B．solve C．solving D．solved
【答案】A
【详解】句意：学生应该学会如何解决问题。
考查动词不定式。特殊疑问词+动词不定式，具有名词的性质，在句子中做主语或宾语。how to solve problems“如何解决问题”，在句中作动词learn的宾语。故选A。
6．（24-25九年级下·江苏宿迁·开学考试）I think _________ important _________ English every morning.
A．that; keep reading B．it’s; keeping reading
C．that; to keep read D．it; to keep reading
【答案】D
【详解】句意：我认为每天早晨坚持读英语很重要。
考查非谓语动词和it作形式宾语。分析句子结构可知，该句考查句型“主语+think it+形容词+to do sth”，其中it是形式宾语，to do sth是真正的宾语，表达“认为做某事是……的”。keep doing“坚持做某事”，故选D。
7．（2025·上海宝山·模拟预测）The lights are still on in the lab. Please remember ________ before leaving.
A．turning them off B．to turn them off C．turning it off D．to turn it off
【答案】B
【详解】句意：实验室的灯还亮着，请记得在离开前关掉它们。
考查动词和代词。remember to do“记得去做”；结合“The lights”可知此处需用them指代。故选B。
8．（2025·北京·模拟预测）—Look! The light in the lab is still on.
—Oh, I forgot ______ it off before leaving.
A．to turn B．turning C．turn D．turned
【答案】A
【详解】句意：——看！实验室的灯还亮着。——哦，我忘记在离开前关掉它了。
考查非谓语动词。forget to do sth. 表示“忘记做某事（事情未做）”，而forget doing sth. 表示“忘记做过某事（事情已做）”。此处表示“忘记关灯（未关）”，因此用动词不定式to turn。故选A。
9．（2024·吉林长春·模拟预测）To keep safe, everyone is supposed ________ a seat belt in the car.
A．wear B．to wear C．wearing D．wore
【答案】B
【详解】句意：为了安全起见，每个人在车里都应该系上安全带。
考查动词不定式。根据“everyone is supposed”可知，be supposed to do sth.“应该做某事”，动词不定式作宾语。故选B。
10．（2024·北京西城·模拟预测）I don’t want ________ some shopping this afternoon.
A．to do B．doing C．did D．do
【答案】A
【详解】句意：我今天下午不想去购物。
考查固定搭配。“want to do sth.”是一个固定搭配，表示“想要做某事”。故选A。
动词不定式作宾语补足语
（1）接不定式作宾语补足语的动词（动词+sb.+to do结构，否定式“动词+sb.+not to do” ）常见的有：
tell 告诉 ask 请 order 命令 warn 警告 teach 教 want 想要
wish 希望 expect 期望 encourage 鼓励 allow 允许 invite 邀请 advise 建议
require 要求 force 强迫
如：Do you want me to find out the phone number 你想要我找出那个电话号码吗？
（2）有些及物动词，接不定式作宾语补足语时（动词+sb.+do ），要省略to。这类及物动词常见的有：
let 让 make 使 have 使 see 看见 watch 注视 hear 听到
notice 注意到 feel 感觉起来
被动语态中要还原to，如 make sb. do被动语态变为 sb. be made to do。
如：I saw him read in the library yesterday. 我昨天看到他在图书馆阅读
He was seen to read in the library yesterday. 他被看见昨天在图书馆阅读。
11．（2025·江苏扬州·一模）—As the High School Entrance exam is coming, students are under great stress.
—We teachers should encourage them ______ nervous, and give them some advice on ______ the stress.
A．not to be; reducing B．not be; to reduce
C．not to be; to reduce D．not be; reducing
【答案】A
【详解】句意：——随着中考的到来，学生们承受着巨大的压力。 ——老师应该鼓励他们不要紧张，并给他们一些减轻压力的建议。
考查动词短语。结合“…students are under great stress”及“encourage them…nervous”可知，学生们在考前压力很大，此处应指老师们“鼓励学生们不要紧张”，第一空后nervous“紧张的”为形容词，则“鼓励某人不要……”的英文表达为“encourage sb. not to be+adj.”，则第一空处应用动词不定式的否定形式“not to be”作宾语补足语；第二空前的介词on后应动词reduce“减少”的动名词形式，“give sb. advice on doing sth.”表示“给某人关于……的建议”。故选A。
12．（24-25九年级下·上海·阶段练习）The rich income enables our family ________ a happy life.
A．to live B．living C．live D．lived
【答案】A
【详解】句意：丰厚的收入使我们一家过上了幸福的生活。
考查非谓语动词。enable sb to do sth“使某人能够做某事”，故选A。
13．（2025·吉林·模拟预测）The teacher asked the students ________ loudly in the library.
A．not to talk B．to not talk C．don’t talk D．not talking
【答案】A
【详解】句意：老师要求学生在图书馆里不要大声喧哗。
考查动词不定式作宾语补足语。根据“The teacher asked the students...loudly in the library.”可知，此处考查固定搭配：ask sb. (not) to do sth.要求某人（不要）做某事。故选A。
14．（2024·广东珠海·模拟预测）—When can I go out to play football, Mum
—Finish your homework first, or I won’t let you ________.
A．to go out B．go out C．going out D．will go out
【答案】B
【详解】句意：——妈妈，我什么时候可以出去踢足球？——先完成你的作业，否则我不会让你出去。
考查非谓语动词。let sb. do sth.“让某人做某事”，动词短语，所以用动词原形，故选B。
15．（2025·吉林·模拟预测）My mother often tells me ________ too much junk food.
A．eat B．not eat C．to eat D．not to eat
【答案】D
【详解】句意：我妈妈经常告诉我不要吃太多垃圾食品。
考查非谓语动词。tell sb (not) to do sth“告诉某人（不要）做某事”，固定短语，所以此处应用动词不定式；结合语境可知，此处指的是“告诉我不要吃太多垃圾食品”，所以应用否定形式not to eat。故选D。
16．（2025·吉林·模拟预测）The students were made ________ the text ten times after class.
A．copy B．to copy C．copying D．copied
【答案】B
【详解】句意：学生们被要求在课后把课文抄写十遍。
考查非谓语动词。copy抄写，动词原形；to copy动词不定式；copying动名词或现在分词形式；copied过去式或过去分词形式。句中谓语动词为“were made”，make sb do sth“使某人做某事”，当make用于被动语态时，其后的不定式to要加上，即be made to do sth“被要求做某事”。故选B。
17．（24-25九年级下·云南昆明·开学考试）Sad movies make me ________.
A．cry B．crying C．to cry D．cried
【答案】A
【详解】句意：悲伤的电影让我哭泣。
考查非谓语动词。make sb. do sth. “使某人做某事”，空格处应填动词原形cry。故选A。
18．（24-25九年级下·黑龙江哈尔滨·开学考试）Our English teacher advises us, especially those who are weak in English, ________ English every morning.
A．reading B．read C．to read
【答案】C
【详解】句意：我们的英语老师建议我们，尤其是那些英语不好的，每天早上读英语。
考查非谓语动词。根据“advises us”可知，考查advise sb to do sth“建议某人做某事”，因此填不定式。故选C。
19．（2025·安徽·模拟预测）The new law requires people ________ household garbage into four categories.
A．sort B．to sort C．sorting D．sorted
【答案】B
【详解】句意：新法律要求人们将生活垃圾分为四类。
考查动词形式。sort分类。require sb. to do sth.意为“要求某人做某事”，符合句意，应用动词不定式to sort作宾补。故选B。
20．（2024·福建泉州·模拟预测）Nowadays, many tourist attractions allow visitors ________ free tickets by reciting poems.
A．getting B．get C．to get
【答案】C
【详解】句意：如今，许多旅游景点允许游客通过朗诵诗歌获得免费门票。
考查非谓语动词。allow sb. to do sth.“允许某人做某事”，动词不定式作宾语补足语。故选C。
3. 动词不定式作目的状语
不定式作目的状语，可放在句首或句末。to表示目的、为了。
如：To learn math well, you must do more exercises. 为了学好数学，你必须多做练习。
We came here to ask you for help. 我们来这是为了向你寻求帮助。
21．（2025·江苏宿迁·一模）As middle school students, we should do everything we can ________ the environment.
A．to protect B．protecting C．protect D．protected
【答案】A
【详解】句意：作为中学生，我们应该尽一切努力保护环境。
考查非谓语动词。根据“we should do everything we can...”可知，尽一切努力是为了保护环境，用不定式表目的。故选A。
22．（2024·甘肃武威·二模）I prefer to have ______ one of the two skirts ______ some money for a dictionary.
A．the cheapest, to save B．a cheaper, to saving C．a cheaper, to save D．the cheaper, to save
【答案】D
【详解】句意：我宁愿买两条裙子中较便宜的那条，省下钱买字典。
考查比较级和to do不定式。the cheapest最便宜的；a cheaper更便宜的，表泛指；the cheaper更便宜的，表特指；to saving是介词to+动名词；to save动词不定式。第一个空，比较两件裙子中的“更便宜的一条”，需用定冠词the+比较级，即the cheaper（两者中较便宜的）。第二个空，考查动词不定式表目的，即“为了省下钱买字典”，用to save。故选D。
23．（2024·吉林·模拟预测）We’d better eat more healthy food and do more exercise ________ healthy.
A．to keep B．keep C．keeping
【答案】A
【详解】句意：我们最好多吃健康食品，多锻炼以保持健康。
考查不定式作目的状语。动词不定式“to do”结构常常用来表示目的，即“为了……”。这里“to keep healthy”表示“为了保持健康”。故选A。
24．（2025·福建泉州·一模）Teenagers should reduce their screen time _______ their eyes.
A．protect B．to protect C．protecting
【答案】B
【详解】句意：青少年应该减少看屏幕的时间来保护眼睛。
考查非谓语动词。根据“Teenagers should reduce their screen time ... their eyes.”可知，减少看屏幕的时间的目的是保护眼睛，故用不定式表示目的。故选B。
25．（2025·吉林长春·模拟预测）We should plant more trees ______ the environment.
A．protect B．protecting C．to protect D．protected
【答案】C
【详解】句意：我们应该种更多的树来保护环境。
考查非谓语动词。protect保护，动词原形；protecting动名词；to protect动词不定式；protected过去式或过去分词。根据句子结构，该空应为动词不定式作目的状语，即“种更多的树是为了保护环境”。故选C。
26．（2025·安徽·模拟预测）Anhui is making great efforts ________ the digital economy to boost economic development.
A．develop B．developing C．to develop D．developed
【答案】C
【详解】句意：安徽正在大力发展数字经济以促进经济发展。
考查非谓语动词。此空表示安徽尽全力的目的，作目的状语，应用动词不定式“to develop”。故选C。
27．（2024·云南昆明·二模）________ the first bus, Eric always get up early.
A．Catch B．Catching C．Catches D．To catch
【答案】D
【详解】句意：为了赶上第一班公交车，Eric总是早起。
考查非谓语动词。根据“... the first bus, Eric always get up early.”可知早起是为了赶上第一班公交车，表示目的“为了赶上”，用“to catch”，故选D。
28．（24-25九年级·安徽芜湖·自主招生）They want to do what they can ________ us.
A．help B．helping C．to help D．helped
【答案】C
【详解】句意：他们想要做他们能做的一切来帮助我们。
考查非谓语动词。根据“They want to do what they can ... us”可知，what they can为宾语从句，在句中充当do的宾语，省略了can后的动词do，空格处表示做事的目的，用动词不定式。故选C。
29．（24-25九年级下·吉林长春·开学考试）Many students work hard ________ their writing skills.
A．improve B．improving C．to improve D．improved
【答案】C
【详解】句意：许多学生努力学习以提高他们的写作能力。
考查非谓语动词。improve提高，动词原形；improving提高，现在分词形式；to improve提高，动词不定式；improved提高，过去分词形式。根据句意和句子结构可知，此处表示目的，即“努力学习”的目的是“提高写作能力”，所以应用动词不定式to improve作目的状语。故选C。
30．（2024·吉林长春·模拟预测）________ down air pollution, we should drive less and use the green transportation more.
A．Cut B．To cut C．Cutting D．Cuts
【答案】B
【详解】句意：为了减少空气污染，我们应该少开车，多使用绿色交通工具。
考查非谓语动词。根据“we should drive less and use the green transportation more.”可知，此处需要使用动词不定式表目的，故选B。
4. 不定式的常见句型
31．（2025·江西·模拟预测）—It’s interesting for us ________ games in the Central Park.
—Yes, I feel the same way.
A．to play B．playing C．play D．plays
【答案】A
【详解】句意：——在中央公园玩游戏对我们来说很有趣。——是的，我也有同感。
考查非谓语动词。It is+形容词+for sb to do sth“对于某人来说做某事是……的”，空处应填动词play的不定式to play。故选A。
32．（23-24九年级下·全国·课堂例题）It took us two hours and a half ________ to Hainan Island.
A．fly B．to fly C．flying D．flies
【答案】B
【详解】句意：我们花了两个半小时飞到海南岛。
考查非谓语动词。It takes sb. some time to do sth.“做某事花费某人一些时间”，为固定句型，故选B。
33．（24-25九年级下·江苏南通·阶段练习）It’s said that the water in the river will be ________ for us ________.
A．too clean; to drink B．enough clean; to drink
C．so clean; to drink D．clean enough; to drink
【答案】D
【详解】句意：据说河里的水将足够干净，我们可以喝。
考查固定结构。too...to...太……而不能；enough...to...足够……能做某事；so...to...表达错误。enough修饰形容词需要后置，根据语境可知，此处表达的是“河里的水足够干净可以喝”，too...to...不符合语境。故选D。
34．（24-25九年级上·四川遂宁·开学考试）He thinks it’s ________ difficult for him ________ deal with the problem by himself.
A．too; to B．so; that C．enough; to D．such; that
【答案】A
【详解】句意：他认为对他来说独自处理这个问题太困难了。
考查动词短语。too...to...太……而不能；so...that...如此……以至于……；enough..to do足够……做……；such...that...如此……以至于……。分析题干可知，此句不需要so/such that引导主从复合句，排除BD；C选项放入意思不符合，A选项正确，故选A。
35．（2024·甘肃陇南·三模）Don’t stay up late. It’s time ________ to bed.
A．go B．went C．going D．to go
【答案】D
【详解】句意：不要熬夜。该睡觉了。
考查非谓语动词。根据“It’s time…”可知，此处为固定句型It’s time to do sth.“到了做某事的时候了”，应用不定式作后置定语。故选D。
36．（2025·广东江门·二模）Some students find ________ very hard ________ in the early morning.
A．is; to get up B．that; get up C．it; to get up D．it’s; gets up
【答案】C
【详解】句意：有些学生发现很难在清晨起床。
考查it的固定句型。此处是结构find it adj. to do sth.“发现做某事是……的”，it作形式宾语，真正的宾语是动词不定式。故选C。
37．（2023·吉林长春·二模）I think ________ not difficult ________ English every morning.
A．that; keep reading B．it’s; to keep reading C．that; to keep read D．it; to keep to read
【答案】B
【详解】句意：我认为每天早上坚持读英语并不难。
考查非谓语动词和代词。that那个，it’s它是，it它；keep reading坚持阅读，keep doing sth“坚持做某事”，排除D项。It’s+形容词+to do sth表示“做某事是……的”，it是形式主语，to do sth是真正主语。故选B。
38．（2024·云南楚雄·三模）—It’s kind of you ________ your time for the community clean up event.
—We are glad to help.
A．volunteer B．to volunteer C．volunteering D．volunteered
【答案】B
【详解】句意：——你们能自愿为社区清理活动贡献时间真是太好了。——我们很乐意帮忙。
考查不定式作主语。根据“It’s kind of you … your time for the community clean up event.”可知 ，此处为it固定句式，构成为It be +adj.+of/for sb. to do sth.“对于某人来说做某事是……” ，It为形式主语，真正的主语为to do不定式。故选B。
39．（21-22九年级上·广东深圳·开学考试）Thanks for the offer. It is very nice ________ you ________ of me.
A．of; to think B．for; to think C．of; thinking D．for; thinking
【答案】A
【详解】句意：谢谢你的提议。你能想到我真是太好了。
考查介词辨析和动词不定式做主语。of……的；for为了。形容词描述事物，用介词for；形容词描述人，用介词of。“nice”指的是人的性格特征，应用介词of，所以该句为句型“It is +adj + of sb to do sth”，意为“某人做某事是……的”，此处it为形式主语，动词不定式是真正的主语。故选A。
40．（24-25九年级上·全国·课后作业）Jim was the first ________ at the finishing line and Dave was the next.
A．arrive B．arriving C．to arrive D．to arriving
【答案】C
【详解】句意：吉姆第一个到达终点，戴夫是下一个。
考查动词不定式。the first one to do sth“第一个做某事的人”，固定用法，此处填动词不定式作后置定语。故选C。
41．（2024·四川·中考真题）—What are you going to do this summer vacation
—I plan ________ my cousin in Hangzhou.
A．visit B．visiting C．to visit D．visited
【答案】C
【详解】句意：——这个暑假你打算做什么？——我计划去杭州看望我的堂兄。
考查非谓语动词。plan to do sth.“计划做某事”，动词不定式作宾语。故选C。
42．（2024·海南·中考真题）In China, family members get together ________ the Mid-Autumn Festival.
A．to celebrate B．celebrate C．celebrated
【答案】A
【详解】句意：在中国，家人聚在一起庆祝中秋节。
考查非谓语动词。根据语境可知，此处表示聚在一起的目的是庆祝中秋节，用不定式形式。故选A。
43．（2024·江苏南通·中考真题）________ more about rare wild animals, I spent some time searching online last night.
A．To learn B．Learning C．Learned D．Learn
【答案】A
【详解】句意：为了了解更多关于珍稀野生动物的信息，我昨晚花了一些时间在网上搜索。
考查非谓语动词。分析句子可知，“昨晚花了一些时间在网上搜索信息”的目的是“了解更多关于珍稀野生动物的信息”，作目的状语用动词不定式。故选A。
44．（2024·天津·中考真题）People may use different body language _________ the same feelings.
A．show B．to show C．showed D．shows
【答案】B
【详解】句意：人们可能会用不同的肢体语言来表达同样的感受。
考查非谓语动词。use sth to do sth“用某物做某事”，使用动词不定式，故选B。
45．（2024·江苏扬州·中考真题）China has made great efforts ________ other countries build high-speed railways.
A．help B．to help C．helping D．helped
【答案】B
【详解】句意：中国为帮助其他国家建设高速铁路做出了巨大努力。
考查非谓语动词。make great efforts to do sth.“努力做某事”，应用动词不定式。故选B。
46．（2024·云南·中考真题）Our headmaster will invite a scientist ________ us a speech on space technology.
A．give B．given C．giving D．to give
【答案】D
【详解】句意：我们的校长将邀请一位科学家为我们做一次关于空间技术的演讲。
考查非谓语动词。invite sb. to do sth.“邀请某人做某事”，动词不定式作宾语补足语。故选D。
47．（2024·四川凉山·中考真题）______ teenagers’ eyesight, experts advise them to stay away from electronic products.
A．Protect B．To protect C．Protecting
【答案】B
【详解】句意：为了保护青少年的视力，专家建议他们远离电子产品。
考查非谓语动词。分析句子可知，专家建议青少年远离电子产品的目的是保护他们的视力，此处是动词不定式作目的状语。故选B。
48．（2024·四川泸州·中考真题）______ healthy, we students always do morning exercises every day at school.
A．Keep B．To keep
C．Keeping D．Keeps
【答案】B
【详解】句意：为了保持健康，我们学生每天在学校总是做早操。
考查非谓语动词。分析句子可知，学生们在学校做早操的目的是为了保持健康，此处应用动词不定式作目的状语。故选B。
49．（2025·安徽·模拟预测）Many young volunteers in Anhui are working hard ________ the environment in the countryside.
A．improve B．improving C．to improve D．improved
【答案】C
【详解】句意：安徽的许多年轻志愿者正在努力改善乡村环境。
考查非谓语动词。“work hard to do sth.”表示“努力做某事”，这里“to improve the environment”表示目的，即许多安徽的年轻志愿者努力工作的目的是改善农村环境。故选C。
50．（2025·安徽·模拟预测）The “State-owned+Collective” village-forest-farm cooperation plan in Anhui is a great way ________ the problems in forest management.
A．solve B．to solve C．solving D．solved
【答案】B
【详解】句意：安徽省“国有+集体村”-林-场合作计划是解决森林管理问题的好办法。
考查非谓语动词。根据“a great way… the problem”可知，此处说的是要解决的问题的方式，所以，“to solve”动词不定时作定语修饰名词way。故选B。
51．（2025·江苏南通·模拟预测）They contacted all the teachers they can turn to ________ their son ________ games in the dorm.
A．to prevent ; playing B．to prevent ; to play
C．preventing ; to play D．preventing ; playing
【答案】A
【详解】句意：他们联系了所有他们能求助的老师，以防止他们的儿子在宿舍里玩游戏。
考查非谓语动词。由“They contacted all the teachers they can turn to...their son...games”可知，此句指联系老师的目的是为了阻止儿子玩游戏，第一空需用不定式表目的；由“prevent”可知，prevent sb. doing“阻止某人做某事”，第二空用动名词。故选A。
52．（2025·安徽·模拟预测）AI technology helps farmers in Anhui ________ crops more efficiently by using drones.
A．plants B．planting C．plant D．planted
【答案】C
【详解】句意：AI技术帮助安徽的农民通过使用无人机更高效地种植作物。
考查非谓语动词。help sb do sth“帮助某人做某事”，为固定短语。故选C。
53．（2025·北京·模拟预测）The teacher told us ______ waste time on video games.
A．don’t B．not to C．not D．to not
【答案】B
【详解】句意：老师告诉我们不要在电子游戏上浪费时间。
考查非谓语动词。tell sb (not) to do“告诉某人（不要）做某事”，动词不定式作宾补，否定形式是在to前加not。故选B。
54．（2025·江苏镇江·一模）With the development of new rural communities (新农村), more and more young people go back to spend time with parents ________ them feel less lonely.
A．making B．to make C．made D．make
【答案】B
【详解】句意：随着新农村社区的发展，越来越多的年轻人回去与父母共度时光，使他们感到不那么孤独。
考查非谓语动词。根据“more and more young people go back to spend time with parents …them feel less lonely.”可知，此处表示年轻人回村与父母共度时光是为了让他们不那么孤独，应用动词不定式表目的。故选B。
55．（2025·四川泸州·一模）—It’s dangerous to swim in this river.
—Yes, you are right. The government has warned people _______ in it.
A．don’t swim B．not to swim C．not swimming D．not swim
【答案】B
【详解】句意：——在这条河里游泳很危险。——是的，你说得对。政府已经警告人们不要在里面游泳。
考查动词不定式的否定形式。根据“The government has warned people…in it”可知，政府已经警告人们不要在里面游泳，warn sb. not to do sth.，即“警告某人不要做某事”。故选B。
56．（2025·上海黄浦·一模）Although her schedule is busy, Lucy manages ________ her homework on time.
A．to finish B．finishing C．finish D．to finishing
【答案】A
【详解】句意：虽然露西的日程排得很满，但她还是设法按时完成了作业。
考查非谓语动词。manage to do sth.“设法做某事”。故选A。
57．（2025·上海闵行·一模）They happened ________ the famous Chinese tennis player at the airport yesterday.
A．saw B．seeing C．see D．to see
【答案】D
【详解】句意：昨天他们在机场碰巧遇到了那位著名的中国网球运动员。
考查动词不定式。saw看见，过去式；seeing看见，现在分词或动名词；see看见，动词原形；to see看见，动词不定式。happen to do sth.表示 “碰巧做某事”，happen to see 表示“碰巧看见”，符合题意，故选D。
58．（2025·上海金山·一模）Mr. Jones expected the insurance company ________ him 300,000 dollars for the vase.
A．pay B．pays C．to pay D．not to pay
【答案】C
【详解】句意：琼斯先生期望保险公司为这个花瓶赔付他30万美元。
考查非谓语动词。expect to do sth.意为“期望做某事”，固定词组。故选C。
59．（2025·上海杨浦·一模）The police reminded the public ________ out for pickpockets in crowded areas.
A．look B．looked C．to look D．looking
【答案】C
【详解】句意：警察提醒公众在拥挤地区要留意扒手。
考查非谓语动词。根据“The police reminded the public...”可知，remind sb. to do sth.“提醒某人做某事”，这里to look out for...作宾语the public的补足语。故选C。
60．（2025·上海松江·一模）Is it necessary for us ________ on clothes before buying them
A．try B．to try C．trying D．tried
【答案】B
【详解】句意：我们买衣服之前有必要试穿一下它们吗？
考查非谓语动词。根据“Is it necessary for us...on clothes”可知，此处是it is+形容词+for sb. to do sth.“某人做某事是……的”，其中it作形式主语，动词不定式作真正的主语。故选B。
61．（2025·上海虹口·一模）The Italian organizations have made a plan ________ more tourists to the landmarks.
A．attract B．to attract
C．attracting D．attracted
【答案】B
【详解】句意：这些意大利组织制定了一项计划，以吸引更多的游客前往这些地标。
考查非谓语动词。attract“吸引”，made a plan“做计划”的目的是为了“吸引更多的游客”，所以用不定式作目的状语。故选B。
62．（2025·上海徐汇·一模）It is getting more difficult ________ tickets for some popular singers’ concerts.
A．buy B．buying C．to buy D．bought
【答案】C
【详解】句意：一些流行歌手演唱会的票越来越难买了。
考查非谓语动词。根据“It is getting more difficult … tickets”可知，此处为“It is+adj.+to do”句型，其中It为形式主语，不定式为真正的主语。故选C。
63．（2025·上海普陀·一模）With only a few minutes left, they managed ________ the game around.
A．turn B．turning C．to turn D．turned
【答案】C
【详解】句意：在只剩下几分钟的情况下，他们设法扭转了比赛局面。
考查非谓语动词。根据“managed”可知，manage to do sth“设法做成某事”，此处为动词不定式作宾语。故选C。
64．（2024·江苏徐州·二模）—Mr. Wu has recommended many books. Have you decided ________
—Yes. This Saturday.
A．how to borrow them B．which to read first
C．when to buy them D．where to find them
【答案】C
【详解】句意：——吴先生推荐了很多书。你决定什么时候买了吗？ ——是的。这个星期六。
考查疑问词辨析。how如何；which哪一个；when什么时候；where在哪里。根据“This Saturday.”可知，空处是问什么时候买书。故选C。
65．（2024·吉林长春·一模）_______ healthy and slim, she eats very little fried food.
A．Keep B．Keeping C．To keep D．kept
【答案】C
【详解】句意：为了保持健康和苗条，她很少持油炸食品。
考查非谓语动词。keep保持，原形；keeping，动名词；to keep，动词不定式；kept，过去分词。分析句型可知，eats为句子的谓语动词，则此处应为非谓语动词，应用动词不定式来表目的，故选C。
66．（24-25九年级下·吉林长春·开学考试）I’m too tired ________ farther, so let’s take a break.
A．walking B．to walk C．walk D．to walking
【答案】B
【详解】句意：我太累了，走不动了，所以我们休息一下吧。
考查固定搭配。too...to...表示“太……而不能……”，此处用to walk，故选B。
67．（24-25九年级下·江苏徐州·开学考试）It was brave ________ him ________ into the fire to save the child.
A．of; rushed B．for; to rush C．of; to rush D．for; rushing
【答案】C
【详解】句意：他冲进火里去救那个孩子，真勇敢。
考查介词和非谓语动词。根据“It was brave…him…into the fire to save the child.”可知，该句型为It is+形容词+of/for sb+to do sth。本句中brave表示“勇敢的”是描述him的性格品质，所以用of sb，该句型中后面要用动词不定式to rush。故选C。
68．（24-25九年级下·广东深圳·开学考试）—I don’t know what ______ about the four great classical Chinese novels.
—Why not read ______ first and then organize your own ideas
A．to write, reviews B．write, reasons
C．to write, results D．to write, rewards
【答案】A
【详解】句意：——我不知道怎么写关于中国四大古典小说的内容。——为什么不先读评论，然后整理自己的想法呢？
考查非谓语动词和名词辨析。reviews评论；reasons原因；results结果；rewards回报。根据“what…about the four great classical Chinese novels.”可知，第一空应是what to+动词原形，表示“做什么”；再由“organize your own ideas”和“read...first”可知，此处是说读评论，然后再整理自己的想法，故选A。
69．（24-25九年级上·云南昆明·期末）As classmates, you are supposed ________ each other in your daily life.
A．help B．helping C．to help D．helped
【答案】C
【详解】句意：作为同学，你们应该在日常生活中互相帮助。
考查非谓语动词。help帮助，动词原形；helping为help的现在分词或动名词形式；to help为动词不定式；helped为help的过去式或过去分词。be supposed to do sth.“应该做某事”，固定短语，此处应用to help。故选C。
70．（23-24九年级下·甘肃武威·开学考试）On her way home Lucy saw a thief ________ in a shop. She stopped ________ 110 at once.
A．steal; calling B．stealing; calling C．stealing; to call D．steal; to call
【答案】C
【详解】句意：在回家的路上，露西看见一个小偷在商店里偷东西。她立刻停下来打了110。
考查非谓语形式。结合语境及句子结构可知，前句指露西看见小偷正在偷东西，应用“see sb. doing sth.”表示“看见某人正在做的动作”，后句指露西停下来拨打电话，应用“stop to do sth.”表示“停下来去做另外一件某事”。故选C。
用所给词的正确形式填空
71．（2025·江苏无锡·一模）He couldn’t decide when (start) the project, which made his team members worried.
【答案】to start
【详解】句意：他不能决定什么时候开始这个项目，这使得他的队员们很担心。疑问词+不定式，可作宾语，start“开始”，动词，此处用其不定式形式。故填to start。
72．（2025·江苏无锡·一模）I think the car needs (check) every year, or it may break down on the road.
【答案】checking/to be checked
【详解】句意：我认为汽车每年都需要检查，否则它可能会在路上抛锚。check“检查”，根据“the car needs ... (check) every year,”可知，此处表示车需要被检查，用结构need doing或need to be done。故填checking/to be checked。
73．（2025·江苏无锡·一模）The amazing scenery in Wuxi always makes it hard for any visitors (describe).
【答案】to describe
【详解】句意：无锡令人惊叹的景色总是让游客难以描述。分析句子结构和所给单词可知，应填describe“描述”的动词不定时形式to describe，作宾语。句意“make it+adj.+for sb to do sth”意为“使做某事对某人来说是……的”，it是形式宾语，不定式是真正的宾语。故填to describe。
74．（2025·甘肃定西·模拟预测）The task is too difficult. Lucy has no choice but (ask) for help.
【答案】to ask
【详解】句意：这个任务太难了，Lucy除了向他人求助别无选择。have no choice but to do sth.“别无选择只能做某事”，固定搭配，故填to ask。
75．（24-25九年级下·湖北武汉·阶段练习） (make) our students responsible and independent, military training (军训) has become a tradition in China.
【答案】To make
【详解】句意：为了培养学生的责任感和独立性，军训已成为中国的一项传统。分析句子结构可知，句子谓语部分为“has become”，所以这里应用动词不定式结构作目的状语，表示军训成为中国的一项传统，其目的是让学生变得有责任感和独立性，位于句首，首字母要大写。故填To make。
76．（23-24九年级上·江苏无锡·期中）The little boy is so worried in the exam because he doesn’t know when (hand) in the paper.
【答案】to hand
【详解】句意：这个小男孩在考试中非常担心，因为他不知道什么时候交卷子。“特殊疑问词+to do”是宾语从句的简化，hand in意为“上交”。故填to hand。
77．（24-25九年级下·江苏泰州·阶段练习）We must try our best to stop the pollution (live) a happier life.
【答案】to live
【详解】句意：我们必须尽我们最大的努力来阻止污染，为了过上更幸福的生活。根据“We must try our best to stop the pollution”可知，句中表达我们必须尽最大努力阻止污染，“a happier life”与“stop the pollution”之间存在目的关系。“to live”是动词不定式，在句中作目的状语，表示“阻止污染”的目的是“过上更幸福的生活”。故填to live。
78．（2025九年级·山东·专题练习）Then I taught him how to use the Internet and how (play) chess online.
【答案】to play
【详解】句意：然后我教他如何使用互联网以及如何在网上下棋。根据“Then I taught him how to use the Internet and how ... chess online.”可知，此处是“疑问词+动词不定式”结构。故填to play。
79．（2025九年级·湖南·专题练习）There was something wrong with the student. A psychologist was called in (help) him.
【答案】to help
【详解】句意：这个学生有点问题。一位心理学家被请来帮助他。help动词，帮助。根据“was called in”可知，此处表目的，应用不定式。故填to help。
80．（2025九年级·湖南·专题练习）Mr Li is very glad (see) his students again.
【答案】to see
【详解】句意：李先生很高兴再次见到他的学生。see“看见”，be glad to do“很高兴做某事”，故用不定式，故填to see。
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