动词不定式
一 用括号内所给动词的适当形式填空。
1. (see) is to believe.
2. It’s important for us (learn) English well.
3. Although the sweater was too expensive, I decided (buy) it.
4. My wish is (become) a doctor when I grow up.
5. Tony asked me (help) him with his Chinese.
6. Jack is always the first student (arrive) at school every day.
7. Mr Wang runs every morning (keep) fit.
8. Helen woke up (find) no one was there.
9. The boss made Helen (work) nine hours a day.
10. I often hear her (sing) in the morning.
11. What (do) next has not been decided.
12. I don’t know how (use) the new MP5 player.
【归纳总结】
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1. 动词不定式的基本形式是“to + 动词原形”，否定形式是“not to + 动词原形”。有时to可以省略。
2. 动词不定式没有人称和数的变化，在句子中不能作谓语。
3. 动词不定式具有动词的特点，可以有自己的宾语和状语。
4. 动词不定式具有名词、形容词和副词的特征，在句中可以作主语、表语、宾语、宾语补足语、定语和状语。
5. 动词不定式和疑问词what, which, how, when, where等连用，构成 ‘Wh-’ words + ‘to’-infinitives结构，相当于一个名词短语，在句中可以作主语、表语和宾语。
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温馨提示：
⑴ 动词不定式作定语时，通常需放在被修饰的名词或代词之后。
⑵ 有些动词的宾语补足语为不定式时不用to。一类是感官动词，如see, watch等；另一类是使役动词，如let, make, have等。但这些动词变为被动语态时，作主补的动词不定式中的to不能省略。
参考答案:
1. To see 2. to learn 3. to buy
4. to become 5. to help 6. to arrive
7. to keep 8. to find 9. work
10. sing 11. to do 12. to use
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