一 概念及构成
构成：______________________________否定形式为：____________________________ 概念：动词不定式是一种非谓语动词，在句中作主语、宾语、定语、表语和宾语补足语。 动词不定式没有人称和数的变化， 二 用法：
1.作主语 常用it作形式主语，真正的主语不定式后置。句式为：It is + adj (+for sb) to do sth. 意为：(对于某人来说)干…是…
例：学习英语很难。____________________________________________________________
再次见到你真是太好了。_____________________________________________________ 你帮助我真是太好了。________________________________________________________ 对我们来说保护环境是很重要的.
___________________________________________________________________________
2.作定语 不定式与被修饰词之间通常有逻辑上的动宾关系。不定式作定语常放在被修饰词之后。 例：我有许多工作要做。________________________________________________________ 请告诉我去学校的路。______________________________________________________ 你有一些吃的吗？__________________________________________________________ 3.作宾语 不定式常用于某些及物动词后作宾语。常见的动词有：
want to do_________________________ hope to do _____________________________ forget to do _________________________ begin to do ____________________________ try to do ____________________________ learn to do ____________________________ remember to do _____________________________would like to do _________________________ offer to do _____________________________ stop to do _______________________________ decide to do ______________________________ agree to do ______________________________ 例：我想和你一起去。________________________________________________________________ 我将尽力学英语。________________________________________________________________ 不要忘记关灯。__________________________________________________________________ 他们决定和我们呆在一起。_________________________________________________________ 注意：
(1) 不定式还可用于句型：主语+ find / think /feel + it + adj /n + to do sth ,在这个句型中， ______是形式宾语，
真正的宾语是后面的_________________________ 例：我发现读这本书很有趣。
____________________________________________________________________________________ (2) 不定式还可和疑问词一起构成“疑问词 + 不定式”结构，在句中作主语，宾语。 例：他们不知道下一步做什么。
_________________________________________________________________________________ (3) 动词remember, forget, stop, try等之后接不定式和v-ing形式作宾语意义差别较大。
remember to do_________________________ remember doing _________________________ forget to do __________________________ forget doing ____________________________ stop to do _____________________________ stop doing _____________________________ try to do ______________________________ try doing _______________________________ 4.作表语 用在be动词后，起解释说明作用。
例：他的工作是教学生。______________________________________________________________ 我的希望是上大学。______________________________________________________________ 我的梦想是当医生。_______________________________________________________________ 5.作补语
A 常跟在动词宾语后，作宾语补足语。句式为：主语 + 谓语 + 宾语 + 动词不定式，常见动词有：
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tell sb to do sth______________________________ ask sb to do sth ____________________________ teach sb to do sth ____________________________
注意：(1) 动词不定式作hear ,see, watch, feel, let, have, make 的宾语补足语时，需省略to 例：我常听他唱歌。_________________________________________________________
老师让我们打扫教室。__________________________________________________________ (2) 动词不定式作help的宾语补足语时，即可带to,又可省略to.
例：他帮我学英语。_________________________________________________________________ B 常跟在形容词后作补语
例：这个问题容易回答。____________________________________________________________ 我发现英语很难学。_________________________________________________________________ 6.作状语 不定式作状语常表目的。
例：他来这里借我的自行车。______________________________________________________________ 练习：
一 用所给动词的适当形式填空
1.I found it not easy ___________________(do) it well.
2.If you are tired, you can stop __________________(take ) a rest. 3.Jim decided _____________________(buy) his father a new car. 4.She asked me ________________________( not go ) home at once.
5.They’ll have us ________________________(stay) here for a long time. 二 单项选择
1.Yesterday I went to the library________________some books on how to protect the environment. A. borrow B. to borrow C borrowing D. borrowed 2.----We can use QQ to communicate with each other online. ------Good. Will you please show me __________________?
A. which to use B. how to use it C. what to use .D where to use it 3.They have decided ______________the meeting this afternoon. A. have B. to having C. not have D. not to have 4.----What do you think of tomorrow’s football match?
-----I think_____________difficult for us__________________the match.
A. we’re; to win B. we’re; winning C. it’s ; to win D. it’s ; winning 5.Beijing, Shanghai and other big cities are exciting places___________________. A. work B. working C. work in D. to work in 6.Last night his mother make a cake _______________him. A. to B. for C. at D. in
7.The teacher has already told me but I’m still not clear __________to do next. A. how B. what C. why D. whether
8.My mother made me____________her with housework on Sundays. A. to help B. helps C. helped D. help 9.Have you decided______________with us?
A. go B. to go C. going D. goes
10.Father often tells me __________too much time on computer games.
A. don’t spend B. not spend D. not to spend D. not spending 三 句型转换
1.To understand what he said is difficult. (改为同义句)
___________ ______________difficult to understand what he said. 2.I hope I can forget all my problems.
I hope ________________ ___________________all my problems.
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3.The two boys want to go fishing this afternoon.(对划线部分提问)
_______________do the two boys want_______________ _______________this afternoon. 4.The room is so big that it can hold one hundred people.(改为同义句)
The room is _______________ ___________________ __________________hold one hundred people. 5.My mother was pleased when she heard me pass the exam.(改为同义句)
My mother was ___________________ _____________________ ________________me pass the exam. 6.Please bring me the storybook.
Please bring the storybook _____________ ________________. 7.He lent Mary his pen yesterday.
He lent his pen ________________ __________________yesterday. 8.I’m glad to buy you something to drink.
I’m glad to buy something _____________ _______________to drink 9.He doesn’t know what he would do next.
He doesn’t know what ____________ _____________next. 10.My parents asked me, “Don’t go out at night alone.”
My parents asked me______________ _________________ _________________out at night alone.
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