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【原创】专题12 动词不定式专项训练 100 题（含解析）
答题技巧
牢记固定搭配：动词不定式在英语中有众多固定搭配，如 “want to do sth.（想要做某事）”“decide to do sth.（决定做某事）”“hope to do sth.（希望做某事）” 等。看到此类结构，直接依据固定形式确定答案。日常学习中要注重积累背诵这些固定搭配，增强记忆熟练度。
分析句子成分：明确动词不定式在句子中所充当的成分，如主语、宾语、表语、定语、状语等。作主语时，常用 it 作形式主语，动词不定式后置；作宾语时，要注意及物动词后可直接跟不定式作宾语；作表语时，用于说明主语的内容；作定语时，常位于被修饰词之后；作状语时，可表示目的、结果、原因等。通过分析句子成分，能准确判断动词不定式的用法是否正确。
区分相似结构：有些结构容易混淆，如 “stop to do sth.（停下来去做另一件事）” 和 “stop doing sth.（停止正在做的事）” 。做题时要仔细分析语境，根据句子表达的含义选择正确的结构。
关注动词不定式的否定形式：动词不定式的否定形式通常是在 to 前加 not，如 “ask sb. not to do sth.（要求某人不要做某事）”“tell sb. not to do sth.（告诉某人不要做某事）” 等。要注意否定词的位置，避免出错。
利用句子语境辅助判断：句子的语境能为动词不定式的选择提供重要线索。通过理解句子的含义、情感色彩以及所描述的情境，可以更准确地判断应该使用动词不定式的何种形式。比如，根据句子所表达的时间、条件等信息，确定动词不定式的时态和语态。
题目分类与分层
（一）基础题（30 题）
主要考查常见、基础的动词不定式用法，形式较为直接，侧重于对基础知识的记忆。
I want ________ (go) shopping with my mother this weekend.
She hopes ________ (become) a famous singer in the future.
They decided ________ (have) a party to celebrate their success.
It's important for us ________ (learn) a foreign language.
The teacher asked us ________ (read) English aloud every morning.
My parents often encourage me ________ (take) part in different activities.
He is too young ________ (go) to school by himself.
We need ________ (buy) some fruits for the party.
She wants ________ (be) a doctor to help sick people.
It's my dream ________ (travel) around the world one day.
They plan ________ (visit) the Great Wall during the summer vacation.
The boy is trying ________ (climb) the tall tree.
I'm glad ________ (hear) that you got good grades.
We should try our best ________ (protect) the environment.
She is always the first ________ (come) to school in our class.
The best way ________ (relax) is to listen to music.
He made me ________ (laugh) with his funny story.
My sister likes ________ (draw) pictures in her free time.
We are looking forward ________ (see) you soon.
It takes me two hours ________ (finish) my homework every day.
They agreed ________ (help) each other in the future.
The doctor advised him ________ (drink) more water.
She is too tired ________ (walk) any further.
We need ________ (clean) the classroom before leaving.
He wants ________ (borrow) my bike for a day.
It's time for us ________ (have) a rest.
My mother asks me ________ (not play) computer games too much.
The little girl is old enough ________ (dress) herself.
We should learn ________ (share) things with others.
He is trying his best ________ (improve) his English.
（二）中等题（40 题）
在基础题的基础上，增加了一定难度，涉及相似结构的辨析、动词不定式在不同语境中的运用，以及一些需要转换形式的情况。
31. She stopped ________ (talk) when the teacher came into the classroom.
32. I remember ________ (lock) the door before I left home, but it's open now.
33. The man seems ________ (be) very angry. What happened
34. We found it difficult ________ (make) friends with him.
35. They are busy ________ (prepare) for the coming exam, but they still want ________ (take) a break.
36. He is used to ________ (get) up early, but he used to ________ (stay) up late.
37. My father promised ________ (buy) me a new bike if I got good grades.
38. She prefers ________ (read) books at home rather than ________ (go) to the cinema.
39. The question is too difficult for me ________ (answer).
40. We should do something ________ (help) the poor people in the village.
41. He is looking for a place ________ (live) because he wants ________ (rent) a house.
42. She is afraid ________ (go) out alone at night.
43. The workers were made ________ (work) for ten hours a day in the past.
44. We'll have a chance ________ (show) our talents in the school talent show.
45. It's no use ________ (complain) about the problems. We should find ways ________ (solve) them.
46. He pretended ________ (be) ill so that he could stay at home.
47. The boy is interested in ________ (collect) stamps, and he hopes ________ (have) a big collection.
48. She started ________ (learn) French last year, and she wants ________ (continue) learning it next year.
49. They had no choice but ________ (wait) for the bus in the rain.
50. We should teach children ________ (be) honest from a young age.
51. My mother often tells me ________ (eat) more vegetables to keep healthy.
52. The old man is too weak ________ (carry) the heavy box.
53. He is busy ________ (write) a report, so he has no time ________ (go) shopping.
54. She is good at ________ (sing), and she dreams of ________ (become) a singer. But she knows she needs ________ (practice) more.
55. We are planning ________ (travel) to Beijing, and we want ________ (visit) the Forbidden City.
56. The teacher asked us ________ (not make) noise in the library.
57. He has difficulty in ________ (pronounce) some English words, so he practices ________ (read) them aloud every day. And he also asks his teacher ________ (help) him.
58. She would rather ________ (stay) at home and watch TV than ________ (go) out on a rainy day.
59. They are proud of ________ (win) the basketball match, and they hope ________ (win) more games in the future.
60. The little girl can't wait ________ (open) the gift box.
61. We haven't decided where ________ (go) for the summer vacation.
62. It's necessary for students ________ (do) eye exercises every day.
63. He is looking forward to ________ (hear) from his pen pal, and he wants ________ (write) back to him soon.
64. She doesn't know how ________ (use) the new machine.
65. We should encourage teenagers ________ (be) independent.
66. The doctor told him ________ (take) the medicine three times a day.
67. He is too busy ________ (help) us. We'd better ________ (ask) someone else.
68. My parents allow me ________ (watch) TV for an hour on weekends.
69. It's important ________ (keep) a balance between study and play.
70. She wants to know what ________ (do) next.
（三）难题（30 题）
这类题目难度较大，通常综合考查多个知识点，包括复杂句型结构中的动词不定式用法、易混淆结构的区分，以及需要结合上下文语境进行判断的情况。
71. The man ________ you talked with just now is my uncle. He came here ________ (tell) me some good news.（考查动词不定式作目的状语与定语从句结合）
72. After graduation, he joined the company ________ was founded by his father. He works hard ________ (make) a success of the company.（考查动词不定式作目的状语与定语从句结合）
73. The woman ________ you met at the party is a famous singer. She is going to give a concert ________ (raise) money for charity.（考查 “介词 + 关系代词” 引导定语从句与动词不定式作目的状语结合）
74. On the way to school, I saw a man ________ dog was lost. He was looking everywhere ________ (find) it.（考查 whose 引导定语从句表示所属关系与动词不定式作目的状语结合）
75. My aunt ________ lives in Shanghai came to visit us last week. She brought us many gifts ________ (show) her love.（考查关系代词引导定语从句作主语与动词不定式作目的状语结合）
76. This is the scientist ________ research has made a great contribution to the field. He is invited ________ (give) a speech at the conference.（考查 whose 引导定语从句表示所属关系在复杂句子中的运用与动词不定式作主语补足语结合）
77. A friend ________ helps you in need is a true friend. We should do something ________ (repay) his kindness.（考查关系代词在定语从句中作主语且先行词指人的情况与动词不定式作目的状语结合）
78. We are looking for the person ________ the book was written by. We want ________ (ask) him some questions about it.（考查 “介词 + 关系代词” 引导定语从句，且介词提前的情况与动词不定式作宾语结合）
79. You'll find some books on the desk ________ you can borrow from the library. They are very useful ________ (help) you learn English.（考查关系代词在定语从句中作宾语的用法与动词不定式作目的状语结合）
80. I got a call from a friend ________ I hadn't seen for a long time. He invited me ________ (go) to his party.（考查关系代词在定语从句中作宾语且从句为否定句的情况与动词不定式作宾语补足语结合）
81. It's said that thousands of people are forced ________ (leave) their homes because of the earthquake. We should do something ________ (help) them.（考查动词不定式作主语补足语与目的状语结合）
82. The only thing that matters is ________ (finish) the task on time. We need ________ (make) a good plan.（考查动词不定式作表语与宾语结合）
83. She is the first woman ________ (win) the Nobel Prize in this field. Her success encourages many women ________ (pursue) their dreams.（考查动词不定式作定语与宾语补足语结合）
84. He is always the last one ________ (leave) the classroom. He usually stays behind ________ (clean) the blackboard.（考查动词不定式作定语与目的状语结合）
85. The best way ________ (solve) the problem is ________ (work) together. We should encourage everyone ________ (participate).（考查动词不定式作定语、表语与宾语补足语结合）
86. I found it hard ________ (believe) what he said. But I decided ________ (give) him a chance.（考查动词不定式作宾语与宾语补足语结合）
87. She seems ________ (be) unhappy. Do you know why Maybe we can do something ________ (cheer) her up.（考查动词不定式作表语与目的状语结合）
88. The company is planning ________ (launch) a new product. They hired an expert ________ (help) with the design.（考查动词不定式作宾语与宾语补足语结合）
89. He is too short ________ (reach) the book on the top shelf. So he uses a ladder ________ (get) it.（考查 “too...to...” 结构与动词不定式作目的状语结合）
90. We are looking forward to ________ (see) the new movie. It's said to be very interesting ________ (watch).（考查动词不定式作宾语与主语补足语结合）
91. The students were asked ________ (write) a composition about their dreams. They spent a lot of time ________ (think) about what to write.（考查动词不定式作宾语补足语与固定搭配 “spend time (in) doing sth.” 结合）
92. She is so kind ________ (help) others. Everyone likes her. We should learn from her ________ (be) a helpful person.（考查 “so + 形容词 + to do sth.” 结构与动词不定式作宾语补足语结合）
93. The teacher encouraged us ________ (read) more books. She said it was a good way ________ (improve) our knowledge.（考查动词不定式作宾语补足语与作定语结合）
94. He has a lot of homework ________ (do) every day. But he still manages ________ (find) time for sports.（考查动词不定式作定语与宾语结合）
95. The man was seen ________ (enter) the building last night. The police are looking for him ________ (find) out what happened.（考查动词不定式作主语补足语与目的状语结合）
96. It's important ________ (protect) the environment. We should start ________ (take) action now.（考查动词不定式作主语与宾语结合）
97. She is busy ________ (prepare) for the exam, but she also wants ________ (take) a short break.（考查固定搭配 “be busy doing sth.” 与动词不定式作宾语结合）
98. The boy is too young ________ (understand) the importance of time. His parents should teach him ________ (value) it.（考查 “too...to...” 结构与动词不定式作宾语补足语结合）
99. We are planning ________ (have) a picnic this weekend. But it depends on the weather ________ (be) fine.（考查动词不定式作宾语与动词不定式作主语结合）
100. The movie is so exciting ________ (watch). I can't wait ________ (see) it again.（考查 “so + 形容词 + to do sth.” 结构与固定搭配 “can't wait to do sth.” 结合）
答案解析
（一）基础题答案解析
to go。“want to do sth.” 表示 “想要做某事”，是固定搭配，所以填 to go。
to become。“hope to do sth.” 表示 “希望做某事”，become 要用不定式形式 to become。
to have。“decide to do sth.” 表示 “决定做某事”，have 要用不定式形式 to have。
to learn。“It's + 形容词 + for sb. to do sth.” 是固定句型，it 作形式主语，真正的主语是后面的动词不定式短语，所以填 to learn。
to read。“ask sb. to do sth.” 表示 “要求某人做某事”，read 要用不定式形式 to read。
to take。“encourage sb. to do sth.” 表示 “鼓励某人做某事”，take 要用不定式形式 to take。
to go。“too...to...” 表示 “太…… 而不能……”，后接动词不定式，go 要用 to go。
to buy。“need to do sth.” 表示 “需要做某事”，buy 要用不定式形式 to buy。
to be。“want to do sth.” 表示 “想要做某事”，be 要用不定式形式 to be。
to travel。“It's one's dream to do sth.” 表示 “做某事是某人的梦想”，travel 要用不定式形式 to travel。
to visit。“plan to do sth.” 表示 “计划做某事”，visit 要用不定式形式 to visit。
to climb。“try to do sth.” 表示 “试图做某事”，climb 要用不定式形式 to climb。
to hear。“be glad to do sth.” 表示 “很高兴做某事”，hear 要用不定式形式 to hear。
to protect。“try one's best to do sth.” 表示 “尽某人最大努力做某事”，protect 要用不定式形式 to protect。
to come。“the first to do sth.” 表示 “第一个做某事”，come 要用不定式形式 to come。
to relax。“the best way to do sth.” 表示 “做某事的最好方法”，relax 要用不定式形式 to relax。
laugh。“make sb. do sth.” 表示 “使某人做某事”，用动词原形 laugh。
to draw。“like to do sth.” 表示 “喜欢做某事”，draw 要用不定式形式 to draw。
to see。“look forward to doing sth.” 表示 “期待做某事”，这里的 to 是介词，后接动词 -ing 形式，see 的 -ing 形式是 seeing。
to finish。“It takes sb. some time to do sth.” 表示 “做某事花费某人多长时间”，finish 要用不定式形式 to finish。
to help。“agree to do sth.” 表示 “同意做某事”，help 要用不定式形式 to help。
to drink。“advise sb. to do sth.” 表示 “建议某人做某事”，drink 要用不定式形式 to drink。
to walk。“too...to...” 表示 “太…… 而不能……”，后接动词不定式，walk 要用 to walk。
to clean。“need to do sth.” 表示 “需要做某事”，clean 要用不定式形式 to clean。
to borrow。“want to do sth.” 表示 “想要做某事”，borrow 要用不定式形式 to borrow。
to have。“It's time for sb. to do sth.” 表示 “到某人做某事的时
not to play。“ask sb. not to do sth.” 是 “ask sb. to do sth.” 的否定形式，意为 “要求某人不要做某事” ，所以用 not to play。
to dress。“形容词 + enough to do sth.” 表示 “足够…… 去做某事”，dress 要用不定式形式 to dress。
to share。“learn to do sth.” 表示 “学习做某事”，share 要用不定式形式 to share。
to improve。“try one's best to do sth.” 表示 “尽某人最大努力做某事”，improve 要用不定式形式 to improve。
（二）中等题答案解析
talking。“stop doing sth.” 表示 “停止正在做的事”，老师进教室时，她停止正在进行的谈话，所以用 talking。
locking。“remember doing sth.” 表示 “记得做过某事”，“lock the door” 这个动作发生在 “left home” 之前，所以用 locking。
to be。“seem to do sth.” 表示 “似乎做某事”，be 要用不定式形式 to be。
to make。“find it + 形容词 + to do sth.” 中，it 作形式宾语，真正的宾语是后面的动词不定式，make 要用 to make。
preparing; to take。“be busy doing sth.” 表示 “忙于做某事”，prepare 要用 preparing；“want to do sth.” 表示 “想要做某事”，take 要用 to take。
getting; stay。“be used to doing sth.” 表示 “习惯于做某事”，get 要用 getting；“used to do sth.” 表示 “过去常常做某事”，stay 用原形。
to buy。“promise to do sth.” 表示 “承诺做某事”，buy 要用不定式形式 to buy。
to read; go。“prefer to do sth. rather than do sth.” 表示 “宁愿做某事而不愿做某事”，所以第一个空用 to read，第二个空用动词原形 go。
to answer。“sth. is + 形容词 + for sb. to do” 表示 “某事对某人来说做起来是…… 的”，answer 要用 to answer。
to help。此处用动词不定式作目的状语，“do something to help...” 表示 “做某事来帮助……”，help 要用 to help。
to live; to rent。“a place to live” 表示 “住的地方”，动词不定式作后置定语；“want to do sth.” 表示 “想要做某事”，rent 要用 to rent。
to go。“be afraid to do sth.” 表示 “害怕做某事”，go 要用 to go。
to work。“be made to do sth.” 表示 “被要求做某事”，是 make sb. do sth. 的被动结构，work 要用 to work。
to show。“have a chance to do sth.” 表示 “有机会做某事”，show 要用不定式形式 to show。
complaining; to solve。“It's no use doing sth.” 表示 “做某事没有用”，complain 要用 complaining；“find ways to do sth.” 表示 “找到做某事的方法”，solve 要用 to solve。
to be。“pretend to do sth.” 表示 “假装做某事”，be 要用不定式形式 to be。
collecting; to have。“be interested in doing sth.” 表示 “对做某事感兴趣”，collect 要用 collecting；“hope to do sth.” 表示 “希望做某事”，have 要用 to have。
to learn; to continue。“start to do sth.” 表示 “开始做某事”，learn 要用 to learn；“want to do sth.” 表示 “想要做某事”，continue 要用 to continue。
to wait。“have no choice but to do sth.” 表示 “除了做某事别无选择”，wait 要用 to wait。
to be。“teach sb. to do sth.” 表示 “教某人做某事”，be 要用不定式形式 to be。
to eat。“tell sb. to do sth.” 表示 “告诉某人做某事”，eat 要用不定式形式 to eat。
to carry。“too...to...” 表示 “太…… 而不能……”，后接动词不定式，carry 要用 to carry。
writing; to go。“be busy doing sth.” 表示 “忙于做某事”，write 要用 writing；“have no time to do sth.” 表示 “没有时间做某事”，go 要用 to go。
singing; becoming; to practice。“be good at doing sth.” 表示 “擅长做某事”，sing 要用 singing；“dream of doing sth.” 表示 “梦想做某事”，become 要用 becoming；“need to do sth.” 表示 “需要做某事”，practice 要用 to practice。
to travel; to visit。“plan to do sth.” 表示 “计划做某事”，travel 要用 to travel；“want to do sth.” 表示 “想要做某事”，visit 要用 to visit。
not to make。“ask sb. not to do sth.” 表示 “要求某人不要做某事”，make 要用 not to make。
pronouncing; reading; to help。“have difficulty in doing sth.” 表示 “做某事有困难”，pronounce 要用 pronouncing；“practice doing sth.” 表示 “练习做某事”，read 要用 reading；“ask sb. to do sth.” 表示 “要求某人做某事”，help 要用 to help。
stay; go。“would rather do sth. than do sth.” 表示 “宁愿做某事而不愿做某事”，两个空都用动词原形。
winning; to win。“be proud of doing sth.” 表示 “为做某事感到骄傲”，win 要用 winning；“hope to do sth.” 表示 “希望做某事”，win 要用 to win。
to open。“can't wait to do sth.” 表示 “迫不及待做某事”，open 要用不定式形式 to open。
to go。“疑问词 + 动词不定式” 结构在句中作宾语，where to go 表示 “去哪里”。
to do。“It's necessary for sb. to do sth.” 表示 “对某人来说做某事是必要的”，do 要用不定式形式 to do。
hearing; to write。“look forward to doing sth.” 表示 “期待做某事”，hear 要用 hearing；“want to do sth.” 表示 “想要做某事”，write 要用 to write。
to use。“疑问词 + 动词不定式” 结构在句中作宾语，how to use 表示 “如何使用”。
to be。“encourage sb. to do sth.” 表示 “鼓励某人做某事”，be 要用不定式形式 to be。
to take。“tell sb. to do sth.” 表示 “告诉某人做某事”，take 要用不定式形式 to take。
to help; ask。“be too busy to do sth.” 表示 “太忙而不能做某事”，help 要用 to help；“had better do sth.” 表示 “最好做某事”，ask 用原形。
to watch。“allow sb. to do sth.” 表示 “允许某人做某事”，watch 要用不定式形式 to watch。
to keep。“It's important to do sth.” 表示 “做某事很重要”，keep 要用不定式形式 to keep。
to do。“疑问词 + 动词不定式” 结构在句中作宾语，what to do 表示 “做什么”。
（三）难题答案解析
whom; to tell。先行词是 “the man”，在从句 “you talked with” 中作宾语，用 whom 引导定语从句；“came here” 的目的是 “tell me some good news”，用动词不定式作目的状语，所以填 to tell。
which/that; to make。先行词是 “the company”，在从句 “was founded by his father” 中作主语，用 which 或 that 引导定语从句；“works hard” 的目的是 “make a success of the company”，用动词不定式作目的状语，所以填 to make。
whom; to raise。先行词是 “the woman”，在从句 “you met at the party” 中作宾语，用 whom 引导定语从句；“give a concert” 的目的是 “raise money for charity”，用动词不定式作目的状语，所以填 to raise。
whose; to find。先行词是 “a man”，“dog” 与 “a man” 构成所属关系，用 whose 引导定语从句；“looking everywhere” 的目的是 “find it”，用动词不定式作目的状语，所以填 to find。
who/that; to show。先行词是 “My aunt”，在从句 “lives in Shanghai” 中作主语，用 who 或 that 引导定语从句；“brought us many gifts” 的目的是 “show her love”，用动词不定式作目的状语，所以填 to show。
whose; to give。先行词是 “the scientist”，“research” 与 “the scientist” 构成所属关系，用 whose 引导定语从句；“is invited” 后接动词不定式作主语补足语，所以填 to give。
who/that; to repay。先行词是 “A friend”，在从句 “helps you in need” 中作主语，用 who 或 that 引导定语从句；“do something” 的目的是 “repay his kindness”，用动词不定式作目的状语，所以填 to repay。
whom; to ask。先行词是 “the person”，在从句 “the book was written by” 中作宾语，用 whom 引导定语从句；“want” 后接动词不定式作宾语，所以填 to ask。
that/which; to help。先行词是 “some books”，在从句 “you can borrow from the library” 中作宾语，用 that 或 which 引导定语从句；“useful” 后接动词不定式作目的状语，所以填 to help。
whom; to go。先行词是 “a friend”，在从句 “I hadn't seen for a long time” 中作宾语，用 whom 引导定语从句；“invited me” 后接动词不定式作宾语补足语，所以填 to go。
to leave; to help。“are forced” 后接动词不定式作主语补足语，所以第一个空填 to leave；“do something” 的目的是 “help them”，用动词不定式作目的状语，所以第二个空填 to help。
to finish; to make。“The only thing that matters is...” 后接动词不定式作表语，所以第一个空填 to finish；“need” 后接动词不定式作宾语，所以第二个空填 to make。
to win; to pursue。“the first woman” 后接动词不定式作定语，所以第一个空填 to win；“encourages many women” 后接动词不定式作宾语补足语，所以第二个空填 to pursue。
to leave; to clean。“the last one” 后接动词不定式作定语，所以第一个空填 to leave；“stays behind” 的目的是 “clean the blackboard”，用动词不定式作目的状语，所以第二个空填 to clean。
to solve; to work; to participate。“the best way” 后接动词不定式作定语，所以第一个空填 to solve；“is” 后接动词不定式作表语，所以第二个空填 to work；“encourage everyone” 后接动词不定式作宾语补足语，所以第三个空填 to participate。
to believe; to give。“found it hard” 后接动词不定式作宾语，所以第一个空填 to believe；“decided” 后接动词不定式作宾语，所以第二个空填 to give。
to be; to cheer。“seems” 后接动词不定式作表语，所以第一个空填 to be；“do something” 的目的是 “cheer her up”，用动词不定式作目的状语，所以第二个空填 to cheer。
to launch; to help。“is planning” 后接动词不定式作宾语，所以第一个空填 to launch；“hired an expert” 后接动词不定式作宾语补足语，所以第二个空填 to help。
to reach; to get。“too short” 后接动词不定式，构成 “too...to...” 结构，所以第一个空填 to reach；“uses a ladder” 的目的是 “get it”，用动词不定式作目的状语，所以第二个空填 to get。
to watch; to see。“so exciting” 后接动词不定式，“The movie is so exciting to watch.” 表示 “这部电影看起来很刺激”；“can't wait” 后接动词不定式，所以第二个空填 to see。
to write; thinking。“were asked” 后接动词不定式作宾语补足语，所以第一个空填 to write；“spend time (in) doing sth.” 表示 “花费时间做某事”，所以第二个空填 thinking。
to help; to be。“so kind” 后接动词不定式，“She is so kind to help others.” 表示 “她很善良，帮助别人”；“learn from her” 后接动词不定式作宾语补足语，所以第二个空填 to be。
to read; to improve。“encouraged us” 后接动词不定式作宾语补足语，所以第一个空填 to read；“a good way” 后接动词不定式作定语，所以第二个空填 to improve。
to do; to find。“a lot of homework” 后接动词不定式作定语，所以第一个空填 to do；“manages” 后接动词不定式作宾语，所以第二个空填 to find。
to enter; to find。“was seen” 后接动词不定式作主语补足语，所以第一个空填 to enter；“looking for him” 的目的是 “find out what happened”，用动词不定式作目的状语，所以第二个空填 to find。
to protect; to take。“It's important” 后接动词不定式作主语，所以第一个空填 to protect；“start” 后接动词不定式作宾语，所以第二个空填 to take。
preparing; to take。“be busy” 后接动词 -ing 形式，所以第一个空填 preparing；“wants” 后接动词不定式作宾语，所以第二个空填 to take。
to understand; to value。“too young” 后接动词不定式，构成 “too...to...” 结构，所以第一个空填 to understand；“teach him” 后接动词不定式作宾语补足语，所以第二个空填 to value。
to have; to be。“are planning” 后接动词不定式作宾语，所以第一个空填 to have；“depends on” 后接动词不定式作宾语，“it depends on the weather to be fine” 表示 “这取决于天气变好”，所以第二个空填 to be。
to watch; to see。“so exciting” 后接动词不定式，“The movie is so exciting to watch.” 表示 “这部电影看起来很刺激”；“can't wait” 后接动词不定式，所以第二个空填 to see。

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