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2026年春译林版（2024）八年级英语下册核心语法精讲精练
Unit 5 Good manners
核心语法：enough to和too...to的用法
一、核心概念
1. 这两个结构是用来干什么的？
enough to：表示“足够……可以做某事”，强调具备了做某事的条件或能力
too...to：表示“太……而不能做某事”，强调超过了限度而导致无法做某事
二、enough to 的用法详解
1. 基本结构：be + 形容词 + enough + to do sth.
这个结构用来描述一个人的品质和能力，表示“某人在某方面已经达到了可以做某事的程度” 。
结构 含义 例句
be + 形容词 + enough + to do 足够……可以做某事 He is strong enough to carry the box. 他足够强壮，能搬动这个箱子。
教材例句 ：
"You are old enough to learn about manners."
"If you're in their way, British people will be polite enough to wait till you move."
2. enough 的词性及位置（重要考点！）
词性 用法 例句
副词 修饰形容词或副词，放在所修饰词之后 The boy is old enough to go to school.
形容词 修饰名词，放在名词之前 We have enough time to finish the work.
易错点提醒 ：
当 enough 修饰形容词时，必须放在形容词之后（如：old enough，不能说 enough old）
当 enough 修饰名词时，可以放在名词之前或之后，但前置更常见
3. 常用形容词搭配
形容词 含义 例句
old 年长的 You are old enough to look after yourself.
strong 强壮的 He is strong enough to lift the box.
kind 善良的 She is kind enough to help others.
clever 聪明的 The boy is clever enough to work out the problem.
patient 耐心的 Millie is patient enough to listen carefully.
generous 慷慨的 Daniel is generous enough to share his things.
三、too...to 的用法详解
1. 基本结构：be + too + 形容词 + to do sth.
这个结构用来表达一个否定的结果，表示“太……而不能做某事” 。
结构 含义 例句
be + too + 形容词 + to do 太……而不能做某事 The box is too heavy to carry. 这箱子太重了搬不动。
教材例句 ：
"British people are too polite to shout loudly in public."
"Suzy was too shy to join the discussion."
2. 为什么这个结构表示否定意义？
too...to 结构本质上表达的是 “因为太……，所以不能……”，不定式部分表示的是一个否定意义的结果 。
原句 含义解析
He is too young to go to school. 他太小了，不能上学。
The problem is too difficult to solve. 问题太难了，无法解决。
四、带逻辑主语的句型（进阶用法）
当需要明确动作的执行者时，可以在不定式前加上 for sb. 。
1. too...to 结构 + for sb.
结构 例句
be + too + 形容词 + for sb. + to do The UK is too far away for Jenny to go there on her own.
2. enough to 结构 + for sb.
结构 例句
be + 形容词 + enough + for sb. + to do The room is big enough for us to live in.
注意：当动词是不及物动词时，不要漏掉介词
The room is big enough to live in.
The chair is comfortable enough to sit on.
The room is big enough to live.（错误，live 是不及物动词）
五、两种结构的转换关系（核心难点！）
这两个结构有时可以互相转换，转换的规则是：将形容词改为反义词，并将 too...to 改为 not...enough to 。
原句 转换后 规则
He is too young to go to school. He is not old enough to go to school. young old
The box is too heavy to carry. The box is not light enough to carry. heavy light
The problem is too difficult to solve. The problem is not easy enough to solve. difficult easy
转换公式 ：
too + 形容词 + to do = not + 反义形容词 + enough + to do
六、特殊用法（重要！）
1. 含有 never 的 too...to 表示肯定意义
当 too...to 结构与 never 连用时，不表示否定，而表示肯定 。
例句 含义
It's never too old to learn. 活到老，学到老。（永远不嫌老而不能学习）
One is never too old to try new things. 一个人永远不会因为年龄大而不能尝试新事物。
2. 含有表示情感形容词的 too...to 表示肯定意义
当 too 后面接表示情感的形容词（如 glad, happy, sad, ready, eager 等）时，too...to 结构也不表示否定 。
例句 含义
He is too sad to hear the sad news. 他听到这个悲伤的消息非常难过。（不是“太难过而不能听”）
七、常见错误提醒（译林版易错点）
常见错误及纠正：
enough 位置错误
He is enough old to go to school.
He is old enough to go to school.
too...to 结构误用为肯定
The box is too heavy to carry it.（动词后多加了 it）
The box is too heavy to carry.（carry 的宾语就是主语 the box）
不及物动词漏掉介词
The room is too small to live.
The room is too small to live in.
转换时形容词反义词用错
He is too young to go. → He is not young enough to go.（ ）
He is too young to go. → He is not old enough to go.（young 的反义词是 old）
双重否定混淆
It's never too old to learn.（认为是否定句）
It's never too old to learn.（这是肯定意义，意思是“永远都能学”）
八、记忆口诀
enough to 口诀
enough to 表足够，形容词在前它在后 ；
修饰名词放前面，enough time 记心间。
too...to 口诀
too...to 表否定，“太……而不能”要记清 ；
too young to go to school，年龄太小不能上学。
转换口诀
too...to 和 enough，转换时要变反义词 ：
too young 变 not old enough，too heavy 变 not light enough。
特殊用法口诀
never too...to 是肯定，活到老来学到老 ；
glad/happy 表情感，too 后接它们不否定。
1．The river is too wide for us to swim ________.
A．cross B．across C．through D．over
2．It’s ______ for us to eat ______ meat every day.
A．healthy, too many B．unhealthy, too many
C．health, much too D．unhealthy, too much
3．Many Chinese people are too shy to say “I love you” to their parents ________ they love them very much.
A．although B．because C．until D．if
4．________ say that English is too difficult for us to learn. We can learn it well with effort.
A．Never B．Always C．Sometimes D．Seldom
5．The football match was so _________ that the man was too _________ to fall asleep.
A．excited, exciting B．exciting, excited
C．exciting, exciting D．excited, excited
6．—I think parents should spend more time ________ their children.
—________. They are often too busy to talk to their children.
A．communicating; Exactly B．communicating with; Exactly
C．communicating; Exact D．communicating with; Exact
7．The desk is too heavy ________ him to move ________.
A．of, it B．for, it C．for, / D．of, /
8．—This pair of shoes is too small to ________ me. Could you show me another
—Of course. Please look at this pair.
A．fix B．try C．fit
9．—Though I know the answer to the question, I am too shy to raise my ________.
—Come on, Jack! Have a try, and I believe you will do it well.
A．head B．foot C．hand
10．—Believe it or not! My grandpa is learning to play the piano.
—Oh! ________.
A．It never rains but it pours B．Every dog has its day
C．One is never too old to learn D．When in Rome, do as the Romans do
11．When I ________ my mistake, it was too late for me to correct it.
A．was aware of B．was interested in C．was good at D．was surprised at
12．He was too sad to say _________ when he heard the bad news.
A．something B．anything C．everything
13．—This article is too hard to understand. I wonder ________.
—Maybe you can turn to Mr. Wu. He reads a lot and is always ready to help.
A．who I can ask for help B．why can I ask for help
C．when I can ask for help D．where can I ask for help
14．Not only I but also my brother ________ too shy to talk with strangers.
A．is B．are C．am
15．The old man in grey was too angry to say ________ just now.
A．nothing B．something C．anything D．everything
16．—________ Mrs. Gao is over seventy years old, she still keeps on studying.
— It’s never too old to learn. She should be proud of herself.
A．Because B．Whether C．Although
17．Because of pollution, this lake is now too harmful to ________ fish.
A．suppose B．smoke C．suggest D．support
18．—I’m too tired to walk further.
—Let’s stop ________ a rest under the big tree.
A．have B．having C．to have D．had
19．Can you give me a hand The box is ________ big ________ pick up.
A．such; that B．to; too C．so; that D．too; to
20．—It’s too difficult for me to learn to swim.
—_________, Millie. With more practice, you can make it.
A．Don’t lose heart B．Thank you C．That’s great D．Go ahead
21．She isn’t _________ to go to school. She is only three years old.
A．old enough B．enough old C．enough big D．big enough
22．He didn’t do his homework ________, though he had ________.
A．carefully enough; enough time
B．careful enough; time enough
C．carelessly enough; enough time
23．—You know, my son is only four. Can he read this English book
—Sure. The book is ________ for him.
A．enough easy B．easy enough C．enough hard D．hard enough
24．This room isn’t big ________ for us ________ live in. We need another one.
A．enough; to B．too; to C．so; that
25．He is ________ to reach the shelf.
A．tall enough B．enough tall C．too tall D．so tall
26．My elder brother is ________ to ride a bike to school by himself.
A．young enough B．old enough C．enough old D．enough young
27．He is ________ to go to school today because he has a fever.
A．enough healthy B．healthy enough C．too sick D．sick too
28．Look! Millie is ________ to get ________ from the shelf.
A．tall enough; enough books B．enough tall; books enough
C．tall enough; books enough D．enough tall; enough books
29．This movie wasn’t ________. Mr. Baker fell asleep halfway through it.
A．interesting enough B．enough interesting C．interested enough
30．The customer thought the potato chips were not ________, so George cut them much thinner to make the customer happy.
A．thin enough B．enough thin C．too thick D．thick too
31．Although Mike ran ________, he still missed the early bus because it left a minute earlier.
A．enough fast B．fast enough C．enough quickly D．quick enough
32．Do you think you could swim _________ to win the competition, Helen
A．quick enough B．quickly enough C．enough quickly
33．—Daniel, would you like some more food Help yourself, please.
—Haha, I know there is ________ on the table, but I’m ________ now. Thank you all the same.
A．enough food; full enough B．food enough; full enough
C．enough food; enough full D．food enough; enough full
34．The meeting room isn’t ________ for all of us. We need a bigger one ________.
A．enough large; stay in B．large enough; to stay in
C．large enough; to stay in it D．enough large; stay in it
35．—Can you understand me, Tony
—Yes, madam. You speak ________, so I can follow you.
A．enough clear B．clear enough C．enough clearly D．clearly enough
36．The girl runs _________ to catch up with others.
A．fast enough B．enough fast C．too fast
37．Who is _________ make ________ in class
A．brave enough to, noise B．enough brave, voice C．brave enough to, sound
38．He doesn’t do his homework ________, so he always makes some mistakes.
A．careful enough B．enough careful C．carefully enough D．enough carefully
39．—What was the weather like last night
—It was dark, but the stars were _______ enough to guide us.
A．bright B．brightlier C．brighter D．brightest
40．This old bike is slow, but it’s ________ to ride to school every day. I don’t need a new one.
A．good enough B．enough good C．well enough D．enough well
41．Our school hall is ________to hold nearly 2,000 people.
A．large enough B．enough large C．small enough D．enough small
42．The 62-year-old lady was ________ to save a young man in the lake.
A．brave enough B．enough brave C．bravely enough D．enough bravely
43．The camera is ________ and I don’t have ________ to buy it.
A．enough expensive; enough money B．expensive enough; money enough
C．expensive enough; enough money D．enough expensive; money enough
44．He was ________ to get the job.
A．enough lucky B．lucky enough C．luck enough
45．The hat is not _________ for me to wear. Could you show me _________ bigger one
A．big enough; a B．big enough; the C．enough big; a D．enough big; the
46．The book is ________ for a 9-year-old child to understand.
A．enough easy B．easy enough C．easily enough D．enough easily
47．My brother is ________ to help my mother with the housework. He is really a great helper.
A．enough young B．young enough C．enough old D．old enough
48．Tom is not ________ to finish his homework before 8:00 p.m.
A．enough quick B．quick enough C．enough quickly D．quickly enough
49．Now many restaurants are full of pre-made meals. But we all want to know if pre-made meals are ________ for us.
A．enough healthy B．health enough C．healthy enough
50．Ben isn’t ________ to go to primary school because he is only five years old.
A．enough old B．enough young C．old enough D．young enough
/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
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参考答案及试题解析
1．B
【解析】句意：这条河太宽了，我们无法游过去。
考查介词辨析。cross横穿，动词；across横穿；through穿过；over在……上方/越过。空格前有动词swim，需用介词与swim搭配表示“游过河”，across强调从一边到另一边，符合语境。故选B。
2．D
【解析】句意：对我们来说，每天吃太多肉是不健康的。
考查形容词辨析及too many/too much用法。第一空：healthy（健康的）和unhealthy（不健康的）为形容词；health（健康）为名词，此处需形容词作表语，根据常识“每天吃太多肉”应是不健康的，排除A、C。第二空：meat（肉）为不可数名词，应用too much修饰，too many修饰可数名词复数。故选D。
3．A
【解析】句意：许多中国人太害羞，不敢对父母说“我爱你”，尽管他们非常爱父母。
考查连词辨析。although尽管；because因为；until直到；if如果。根据“Many Chinese people are too shy to say ‘I love you’ to their parents…they love them very much.”的语境可知，此处句意发生了让步，用although引导让步状语从句。故选A。
4．A
【解析】句意：永远不要说英语对我们来说太难学。通过努力我们可以学好它。
考查副词辨析。Never从不；Always总是；Sometimes有时；Seldom很少。根据“...say that English is too difficult for us to learn. We can learn it well with effort.”可知，后句提到我们可以通过努力学好它，前句应表示不要说英语太难学，强调否定态度，Never符合语境。故选A。
5．B
【解析】句意：这场足球比赛如此令人兴奋，以至于这个男人太兴奋了睡不着觉。
考查形容词辨析。excited感到兴奋的，通常用来修饰人；exciting令人兴奋的，通常用来修饰事物。第一空修饰事物“the football match”，用exciting；第二空修饰“the man”，修饰人，用excited。故选B。
6．B
【解析】句意：——我认为父母应该花更多时间与他们的孩子交流。——确实如此。他们经常太忙而没时间和孩子说话。
考查动词短语和副词辨析。communicating交流；communicating with与……交流；Exactly“确切地”；Exact“确切的”。spend time (in) doing sth.“花费时间做某事”，根据“their children”可知，此处应用communicate with sb.“与某人交流”，第一空应填communicating with；Exactly“确实如此”，副词，用于赞同对方观点，第二空应填Exactly。故选B。
7．C
【解析】句意：这张桌子对他来说太重了，他搬不动。
考查不定式的句型。of属于……的；for对；it它；/不填。句型“too + 形容词 + for sb. to do sth.”表示“对某人来说太……而不能做某事”，其中“for sb.”为不定式的逻辑主语，且不定式后若宾语与主语重复则省略。本句中“move”的宾语即前文“the desk”，故无需再加“it”。故选C。
8．C
【解析】句意：——这双鞋太小了，我穿不合适。你能给我看看另一双吗？——当然可以。请看看这双。
考查动词辨析。fix修理；try尝试；fit (衣服、鞋子等) 合身。根据“This pair of shoes is too small to…me.”可知，此处指鞋子太小不合脚。故选C。
9．C
【解析】句意：——虽然我知道问题的答案，但我太害羞了，不敢举起我的手。——加油，杰克！试一下吧，我相信你能做得很好。
考查名词辨析。head头；foot脚；hand手。根据“I am too shy to raise my…”可知，这里表示太害羞了，不敢举手；raise one’s hand“举手”。故选C。
10．C
【解析】句意：——信不信由你！我爷爷在学弹钢琴。——哦！活到老，学到老。
考查谚语/习语。It never rains but it pours祸不单行；Every dog has its day凡人皆有得意日；One is never too old to learn活到老，学到老；When in Rome, do as the Romans do入乡随俗。根据对话内容可知，爷爷 (老年人) 学习新事物 (弹钢琴)，强调学习不受年龄限制。故选C。
11．A
【解析】句意：当我意识到我的错误时，对我来说改正它已经太晚了。
考查形容词短语。was aware of意识到；was interested in对……感兴趣；was good at擅长；was surprised at对……感到惊讶。根据“...it was too late for me to correct it.”可知，句子强调在意识到错误时已无法纠正。故选A。
12．B
【解析】句意：当他听到这个坏消息时，他太伤心了，什么也说不出来。
考查不定代词辨析。something某事，用于肯定句；anything任何事情，常用于否定或疑问句；everything每件事。too…to…结构表示“太……而不能……”，具有否定含义，因此空处需用anything。故选B。
13．A
【解析】句意：——这篇文章太难理解了，我想知道我可以向谁求助。——可能你可以找吴老师帮忙，他读了很多书并且总是乐于助人。
考查宾语从句。根据“Maybe you can turn to Mr. Wu”可以找吴先生帮忙；可知此处指“向谁求助”，引导词用who。故选A。
14．A
【解析】句意：不仅我而且我哥哥也太害羞不敢和陌生人说话。
考查主谓一致。is是，主语为三单；are是，主语为复数或第二人称；am是，主语为I。根据“Not only I but also my brother”可知，在not only...but also...结构中，谓语动词应与but also后的主语保持一致（就近原则）。此处，but also后的主语my brother是第三人称单数，因此动词需用is。故选A。
15．C
【解析】句意：那个穿灰衣的老人刚才太生气了，以至于说不出任何话。
考查不定代词在否定句中的用法。nothing没有什么；something某事，常用于肯定句；anything任何事，常用于否定句和疑问句；everything一切。根据“The old man in grey was too angry to say ... just now.”可知，应该是老人刚才太生气了，以至于说不出“任何”话，由于“too...to...”结构本身表示否定，因此宾语需用anything，符合否定语境。故选C。
16．C
【解析】句意：——尽管高女士已经七十多岁了，但她仍然坚持学习。——活到老，学到老。她应该为自己感到骄傲。
考查连词辨析。Because因为；Whether是否；Although尽管。根据“Mrs. Gao is over seventy years old, she still keeps on studying”可知，此处是让步关系，用Although引导让步状语从句，表示“尽管……仍……”。故选C。
17．D
【解析】句意：由于污染，这个湖现在太有害了，无法养活鱼类。
考查动词辨析。suppose假设；smoke吸烟；suggest建议；support养活。根据“too harmful”和“fish”可知，湖因污染无法养活鱼类，support符合语境。故选D。
18．C
【解析】句意：——我太累了，走不远了。——我们停下来在那棵大树下休息一下吧。
考查动词不定式作目的状语。根据“I’m too tired to walk further.”和“stop…a rest under the big tree”可知，太累了需要停下来休息，所以应用stop to do sth.表示“停下来去做另一件事”，此处动词不定式作目的状语。故选 C。
19．D
【解析】句意：你能帮我吗？这个箱子太大了，拿不起来。
考查too...to结构。such...that如此……以至于……，that后跟句子；to...too结构错误；so...that如此……以至于……，that后跟句子；too...to太……而不能……，to后跟动词原形。根据“The box is ...big...pick up.”可知，是指箱子太大了而拿不起来，pick是动词原形，用too...to结构。故选D。
20．A
【解析】句意：——对我来说，学习游泳太难了。——别灰心，米莉。多加练习，你一定能行的。
考查情景交际。Don’t lose heart别灰心；Thank you谢谢你；That’s great那太好了；Go ahead去吧。根据“With more practice, you can make it.”可知，在鼓励对方别灰心。故选A。
21．A
【解析】句意：她还不够大去上学。她只有三岁。
考查形容词辨析及enough的用法。old enough足够大；enough old错误语序；enough big错误语序；big enough足够大。enough修饰形容词或副词时，应放在被修饰词之后，且表示年龄大小用old而不用big。根据句意，她只有三岁，应表达“不够大（不够年龄）”。故选A。
22．A
【解析】句意：他没有足够认真地做作业，尽管他有足够的时间。
考查副词与形容词的用法以及enough的位置。enough修饰形容词或副词时，置于其后；修饰名词时，置于其前。第一空修饰动词do，应用副词carefully（认真地），carelessly（粗心地）不符合句意，且enough置于其后；第二空修饰名词time，应用enough置于其前。故选A。
23．B
【解析】句意：——你知道，我儿子才四岁。他能读这本英语书吗？——当然。这本书对他来说足够简单。
考查形容词辨析和enough的位置。easy简单的；hard难的。根据“Sure”可知，书是“足够简单”的。enough修饰形容词或副词时，需放在其后，构成“adj./adv.+enough”结构。easy enough符合句意和结构。故选B。
24．A
【解析】句意：这个房间对我们来说不够大，住不下。我们需要另一个房间。
考查固定句式。enough...to do...足够……去做……；too...to...太……而不能……；so...that...如此……以至于……。根据句意“不够大，住不下”可知，应用“形容词+enough+to do”结构表示“足够……去做……”，否定形式意为“不够……而不能……”。故选A。
25．A
【解析】句意：他足够高，能够到架子。
考查enough的用法。tall enough足够高；enough tall错误语序；too tall太高；so tall如此高。enough修饰形容词或副词时应后置，即“形容词/副词+enough”，且根据句意“能够到架子”需表示“足够高”，而非“太高”或“如此高”，且“形容词 + enough + to do”为固定搭配。故选A。
26．B
【解析】句意：我哥哥年龄足够大，可以自己骑自行车上学了。
考查形容词辨析和enough的用法。young enough足够年轻；old enough足够年长；enough old语序错误；enough young语序错误。enough修饰形容词或副词时，应放在被修饰词之后，即“形容词/副词+enough”。根据句意“自己骑自行车上学”可知，需要年龄足够大才符合逻辑，即“old enough”。故选B。
27．C
【解析】句意：他今天病得太重而不能去上学，因为他发烧了。
考查短语辨析。enough healthy表述错误，enough修饰形容词时应置于形容词之后；healthy enough足够健康；too sick病得太重；sick too表述错误，too一般不直接修饰形容词原级置于其后。根据“because he has a fever”可知，他发烧了，所以应是病得太重而不能去上学，too...to...表示“太……而不能……”，所以此处应用too sick。故选C。
28．A
【解析】句意：看！米莉足够高，可以从书架上拿到足够的书。
考查enough的用法。enough修饰形容词或副词时，要后置；修饰名词时，要前置。根据“tall”可知，是形容词，enough放在tall后面；根据“books”可知，是名词，enough放在book前面。故选A。
29．A
【解析】句意：这部电影不够有趣，贝克先生在看了一半的时候就睡着了。
考查形容词和enough的用法。interesting enough足够有趣；enough interesting结构错误；interested enough足够感兴趣。根据“Mr. Baker fell asleep halfway through it”可知，电影不够有趣，修饰物用interesting，enough修饰形容词需后置，故选A。
30．A
【解析】句意：顾客认为薯片不够薄，所以乔治把它们切得更薄来让顾客满意。
考查enough的用法。thin enough足够薄；enough thin错误表达；too thick太厚；thick too错误表达。 根据“so George cut them much thinner”可知，顾客之前觉得薯片“不够薄”，enough修饰形容词时要后置，“thin enough”的否定形式“not thin enough”意为“不够薄”，符合语义。故选A。
31．B
【解析】句意：虽然Mike跑得足够快，但他还是错过了早班车，因为它早走了一分钟。
考查副词辨析和enough的用法。enough fast错误表达；fast enough足够快；enough quickly错误表达；quick enough足够快。enough修饰形容词或副词时，必须后置，所以排除选项A和C；run fast“跑得快”。故选B。
32．B
【解析】句意：海伦，你认为你能游得足够快来赢得比赛吗？
考查副词用法及enough的位置。动词swim需用副词修饰，表示方式；quickly是副词形式，而quick是形容词，不适用。enough修饰副词时应后置，quickly enough正确，故选B。
33．A
【解析】句意：——Daniel，你想再吃点东西吗？请自便。——哈哈，我知道桌子上有足够的食物，但我现在已经吃得够饱了。还是谢谢你。
考查enough的用法。第一个空需表示“足够的食物”，enough修饰名词时放在名词前，应填enough food；第二个空需表示“吃饱了”，enough修饰形容词时放在形容词后，应填full enough。故选A。
34．B
【解析】句意：会议室对我们所有人来说不够大。我们需要一个更大的来待在里面。
考查enough的用法和不定式表示目的。enough修饰形容词时，应置于形容词后，即“large enough”（足够大）。第二空“to stay in”是不定式作后置定语修饰“a bigger one”，此处“one”指代前面的“meeting room”，不定式中的“in”已经与“one”构成逻辑上的动宾关系，不需要再加“it”，因此排除C选项。故选B。
35．D
【解析】句意：——Tony，你能理解我吗？——是的，夫人。你说得足够清晰，所以我能跟得上。
考查副词修饰动词及enough的位置。enough clear结构有误；clear enough足够清晰的；enough clearly结构有误；clearly enough足够清晰地。enough修饰形容词或副词时应后置，speak是动词，需用副词clearly修饰，表示“说得清晰”。故选D。
36．A
【解析】句意：这个女孩跑得足够快，能赶上其他人。
考查enough的用法。fast enough足够快；enough fast用法错误；too fast太快。enough修饰形容词或副词时应后置；根据“to catch up with others”可知，这里表示跑得足够快，能赶上其他人，故用fast enough。故选A。
37．A
【解析】句意：谁足够勇敢在课堂上喧哗？
考查enough的用法和名词辨析。brave enough to足够勇敢去（做某事）；enough brave错误用法；noise噪音；voice嗓音；sound声音。根据“make...in class”可知，此处表示在课堂上制造噪音。故选A。
38．C
【解析】句意：他做作业不够认真，所以总是犯一些错误。
考查enough的用法和副词辨析。此处修饰动词“do”，需用副词“carefully”，“enough”修饰形容词或副词时，要放在其后，因此“足够认真地”表达为“carefully enough”。故选C。
39．A
【解析】句意：——昨晚天气怎么样？——天很黑，但星星足够明亮来指引我们。
考查形容词、副词辨析及enough的用法。bright明亮的，形容词原级；brightlier单词错误，副词brightly的比较级应为more brightly；brighter更明亮的，形容词比较级；brightest最明亮的，形容词最高级，通常与定冠词the搭配。分析题干，enough前通常接形容词或副词原级表示“足够……”，再结合be动词were可知，空处需用形容词原级bright与enough搭配，意为“足够明亮的”，在句中作表语。故选A。
40．A
【解析】句意：这辆旧自行车很慢，但每天骑去上学足够好。我不需要一辆新的。
考查enough和形容词的用法。enough修饰形容词时应置于其后，所以B选项和D选项结构错误，需要排除；good enough足够好；well enough中，well作形容词时仅表示“身体健康”，无法描述自行车的实用性；作副词时需修饰动词，而题干中系动词is后需接形容词作表语，因此well enough不符合语境。所以只有A选项正确，故选A。
41．A
【解析】句意：我们学校的大厅足够大去容纳近2000人。
考查enough的用法。 large enough足够大； enough large顺序错误；small enough足够小； enough small顺序错误且意思不符。根据句意，容纳2000人需大厅“足够大”，且语法正确enough修饰形容词时，应置于形容词之后。故选A。
42．A
【解析】句意：这位62岁的女士足够勇敢，在湖中救了一名年轻男子。
考查形容词和enough的用法。enough修饰形容词或副词时，位于其后，排除B和D；句中空格前“was”后需接形容词作表语，即用brave enough，排除C。故选A。
43．C
【解析】句意：这个相机足够贵，而且我没有足够的钱买它。
考查enough的用法。enough“足够的”，作形容词修饰名词时，放在名词前；作副词修饰形容词时，放在形容词后。第一空修饰形容词expensive，用enough后置；第二空修饰名词money，用enough前置。故选C。
44．B
【解析】句意：他足够幸运得到这份工作。
考查enough的用法和词汇辨析。 lucky幸运的，形容词；luck运气，名词。enough修饰形容词时须置于形容词之后，排除A；C项“luck enough”中“luck”为名词，此处需用形容词“lucky”。故选B。
45．A
【解析】句意：这顶帽子我戴不够大。你能给我拿一顶更大的吗？
考查enough的用法和冠词辨析。根据“The hat is not...for me to wear. Could you show me...bigger one ”可知，第一空表示“不够大”，enough修饰形容词时需后置，故用big enough；第二空表示泛指“一个更大的”，用不定冠词a。故选A。
46．B
【解析】句意：这本书对一个9岁的孩子来说很容易理解。
考查形容词作表语和enough的用法。enough easy错误表达；easy enough足够容易；easily enough足够容易地；enough easily错误表达。本句是主系表结构，be动词后面跟形容词作表语，easy是形容词，easily是副词，故排除C和D；enough修饰形容词、副词要后置。故选B。
47．D
【解析】句意：我弟弟已经足够大，可以帮妈妈做家务了。他真是个好帮手。
考查enough的用法。enough young表述错误；young enough足够年轻；enough old表述错误；old enough足够大。根据“My brother is…to help my mother with the housework. He is really a great helper.”可知，这里是enough修饰形容词，要后置，此处指年龄足够大可以帮忙，old enough符合语境。故选D。
48．B
【解析】句意：Tom没有足够快地在晚上8点之前完成作业。
考查形容词和副词的用法及enough的位置。enough quick错误表达；quick enough足够快；enough quickly错误表达；quickly enough足够快地。根据“Tom is not…to finish his homework before 8:00 p.m.”可知，enough修饰形容词或副词时要后置，排除 A、C；此处is是系动词，后接形容词作表语，quick是形容词，quickly是副词，quick enough符合语境，排除D。故选B。
49．C
【解析】句意：现在许多餐厅都充满了预制菜。但我们都想知道预制菜对我们是否足够健康。
考查enough后置。enough healthy搭配错误；health enough搭配错误；healthy enough足够健康。enough修饰形容词或副词时应后置，结合题干可知，are后接形容词作表语，此处需用“形容词+enough”结构，故选C。
50．C
【解析】句意：Ben不够大，不能上小学，因为他只有五岁。
考查“enough”的用法。“enough”修饰形容词须后置，排除A、B；根据“he is only five years old”可知，他（年纪）不够大。故选C。
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