思马得英语100个句子学英语语法（52）：关于不定式用法的注意点

　　<例句>

　　She tried to explain.

　　她试图解释一下。

　　<语法分析>

　　有些动词可以用不定式直接作宾语，如try, want, like, wish, hate, mean, pretend, begin, decide, learn, determine和 expect 等。还有些动词不能直接跟不定式作宾语，需用it代替不定式作宾语，这些动词有find, make, think, consider 和feel 等。也有些动词不能直接跟不定式作宾语，需在不定式前加连接代词或连接副词。有些动词可以跟不定式作宾语补语，如 love, teach, ask, get, tell, invite, force, oblige 和 beg 等。

　　<触类旁通>

　　(1) Her father cannot afford to buy her a bike.

　　她的爸爸无法给她买辆自行车。

　　语法分析：不定式直接作宾语。

　　(2) I thought it impossible to arrive that place in one hour.

　　我认为一个小时到达那个地方是不可能。

　　语法分析：it代替不定式作宾语。

　　(3) Does she know which to take?

　　她知道要哪一个吗?

　　语法分析：动词know不能直接用不定式作宾语，需在不定式前加连接代词或连接副词。

　　(4) She asked me to help her with lessons this evening.

　　她请我晚上帮她补习功课。

　　语法分析：有些动词可以跟不定式作宾语补语。

　　(5) I wait for you to decide.

　　我等你做出决定。

　　语法分析：有些动词也可跟不定式作宾语补语。

　　(6) Listen to me read the text.

　　听我读课文。

　　语法分析：使役动词和某些感官动词后可接不定式作宾语，在主动语态里，不定式省去to。

　　<巩固练习>

　　1. The birds refused ____[take] him back.

　　2. She decided _____[do] some experiments to test her theory.

　　3. He pretended _____[finish] it.

　　4. This has made it necessary for agriculture and industry _____[develop] very quickly.

　　5. Do you consider it better not _____[go].

　　6. They know _____ to do it.

　　7. Nobody knows _____ to do next.

　　8. I've forgot ____ way to take.

　　9. She got young girls _____[learn] nursing there.

　　10. I ask Tom _____[lend] me some money.

　　11. I long for you ____[see] him.

　　12. I hope you'll advise me what _____[do].

　　13. He made some candles _____[give] light.

　　14. I made a big fire _____[keep] off the wild animals.

　　15. I have found her _____[be] friendly.

　　<参考答案>

　　1. to take 2. to do 3. to have finished 4. to develop 5. to go 6. how 7. what 8. which 9. to learn 10. to lend 11. to see 12. to do 13. to give 14. to keep 15. to be