河南省新密一高高三英语语法专项复习：动词不定式.ppt

动词不定式
一、不定式结构作主语
To see one time is better than to hear a hundred times.
To persevere means victory!
注①:在很多情况下,特别是在口语中,常采用先行it代替主语,而把不定式后置:
It’s a great pleasure to be here.
It is not an easy thing to master a language.
注②:这种后置不定式的结构也适用于某些谓语动词不是系动词的句子,如:
It took us five hours to get there.
It made us very angry to hear him talk like that.
注③:不定式结构的逻辑主语通常可在特定的上下文或情景中看出,也可以由“ for + 名词词组”来表示,如:
It is not hard for one to do a bit of good.
It was difficult for me to do the work.
注④:某些形容词在上述结构中作表语时,常在不定式之前加上“of + 名词词组”来说明不定式所指的是谁的情况,如:
It’s kind of you to think so much of us.
It’s very nice of you to be so considerate.
It’s unwise of them to turn down the proposal.
It was careless of her to make such a mistake.
二、不定式结构作表语
(其含义往往一是条件,一是结果),如:
To be kind to the enemy is to be cruel to the people.
To do that would be to cut the foot to fit the
, duty, hope, idea, intention, mistake, plan, proposal, job, suggestion 等为中心词的名词词组,或以 what 引导的名词性从句表示,后面的不定式说明其内容,如:
My idea is to climb the mountain from the north.
Your mistake was not to write that letter.
My suggestion is to start work at once.
What I would suggest is to start work at once.
三、不定式结构作动词宾语
1.“动词+ 带 to 的不定式结构”。这类动词常见的有:afford, agree, arrange, ask, choose, decide, demand, desire, expect, hope, learn, manage, offer, pretend, promise, refuse, want, wish, like, hate, prefer, continue, try, start, forget, mean, intend, begin, 等,例如:
I’ve arranged to meet him at ten o’clock.
I didn’t expect to find you here.
2.“动词+ 疑问词+ 带 to 的不定式结构”。(这种不定式结构接近一个名词从句)。这类动词常见的有:tell, advise, show, teach, find out, decide, discuss, learn, forget, know, explain, remember, see, understand, wonder 等。
疑问词(也称连接代/副词)有:what, where, who(m), when, how, whether, which(why 除外),如:
I don’t know what to do / where to go / who(m) to ask / when to stop / how to get there.
I haven’t decided whether to sell it or not.
We must find out what to do next / where to put it.
注①:如果作宾语的不定式结构有自己的补语,则应使用先行 it,