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动词不定式可以充当________以外的所有成份；不定式作主语或宾语时，常用________形式主语或形式宾语；在see, hear, watch, feel, notice, observe, make, let, have, listen to, look at等词后的补足语中，不定式不带to，但是这些句子如果变成被动结构，就必须带________；动词不定式在介词________，________，________后面时，如果这些介词之前有行为动词do的各种形式，那么，这些介词后的不定式不带to，否则要带to。
选词填空
turn back往回走，使…倒转 turn down把(收音机等)开小一些
turn in上交，上床睡觉 turn on开(收音机，灯等)
turn off关(收音机，灯等)
turn out生产，制造(成品)或跟不定式，构成复合谓语，跟从句(用it作主语)其后跟形容词、副词、名词、意为结果，原来(情况)
turn over移交，翻阅，考虑，细想 turn to向…求助，翻到
turn up出现，来(开会，赴约等)(把收音机)开大一点声
(1)To whom should we ________ the key when we leave the room?
(2)“Please ________ page 40,”said the teacher．
(3)He promised to attend my birthday party, but till now he hasn’t ________ yet．
(4)Excuse me, ________ the radio a little．I could hear nothing．
(5)If you have any difficulty, you can ________ me．
(6)That radio is pretty loud．Could you ________ it ________ a little?
(7)I want to ________ early tonight because I should get up early tomorrow．
(8)Remember to ________ all the lights before you leave the room．
(9)Have you ________ your exercise book?
(10)The wheel of history can never be ________．
(11)Would you mind ________ the light?It is dark．
(12)She was afraid things were not going to ________ smooth for us．
(13)The English evening party ________ a great success．
(14)The factory ________ 2000 new cars last year．
(15)It ________ that he has never been there．No wonder he knows nothing about it．
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2. 学习有关语言的知识比使用语言容易。(动词-ing形式作主语)
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3. 我们应该尽力增强我们的体质。(build up)
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4. 好的习惯是成功的关键。(lead to)
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5. 我们把书放进书柜的目的是不沾上灰尘。(keep... free from)
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6. 我们会议的重点是妇女权利问题。(focus)
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7. 她设法降低她的体重。(reduce)
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8. 对人们说的话我不会作评论。(comment)
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9. 你是最后一个通过驾驶执照考试的人。(the last+动词不定式)
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10. 作无益的后悔是没有用的。(it作形式主语)
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Every day Jeff 1 （put）on an man?made leg.The leg is plastic.With the plastic leg,Jeff can ski,ride 2 （冠词）bicycle,swim and play soccer.He can also run.When he 3 （be）22 years old,Jeff ran across the United States,from the East 4 ?（介词）the West.He ran 5150 kilometers， 5 it was about 26 kilometers each day（改成非限制性定语从句）.Jeff wore out 36 pairs of 6 （run）shoes and five plastic 7 （leg）.On his way,people in every city gave Jeff money.The money that Jeff received was not for 8 （反身代词）.It was for the American Cancer Society.The Society used the money 9 learn（不定式）about cancer.At the same time,Jeff talked to people about cancer.He also talked about being disabled.Jeff is disabled，
?10 he can do many things （构成并列句）.
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