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高二英语语法专练非谓动动词词不定式人教版
高二英语语法专练非谓动词动词不定式
I. The Forms of the Infinitive:
1. The affirmative form: to + do sth. / do sth.
2. The negative form: not (never) to do sth. / not (never) do sth.
3. The interrogative form: wh- / how + to do sth.
II. The Functions of the Infinitive
1. Subject:
(1) Form: ± (Not) To do sth. + V + …
± It + V + … + (not) to do sth.
(2) Examples:
? To see is to believe.
? Not to meet him at the party made us disappointed.
? It is very important to learn how to use the computer.
? It took the workers three years to finish building the bridge.
【Note】It is only the formal subject in the sentence. The real subject is the
infinitive in the last two sentences.
2. Predicative:
(1) Form: ± S + Be + (not) to do sth. / do sth.
(2) Examples:
? The duty of a nurse is to take good care of the patients.
? The purpose of Hope Project is to help the poor children in the countryside.
? The students’ task in school is to study hard, not to play.
? All that they can do is (to) wait for the news.
? What I should do is (to) help those who are in trouble.
【Note】When the subject is a clause with the words “all, what, do”, the infinitive used as predicative can omit the sign of the infinitive “to”.
3. Object:
(1) Form: ± S + Vt + (not) to do sth.
± S + link.v + adj. + (not) to do sth.
± S + Vt + wh- / how to do sth. = S + V(t) + object clause.
± S + Vt + it + adj. / n. + to do sth.
(2) Examples:
? The workers demanded to get better pay.
? They decided to start early tomorrow morning.
? I’m sorry to hear the bad news.
? You are free to go or stay.
? I don’t know what to do next. (= I don’t know what I should do next.)
? They didn’t decide how to go to the station.
(= They didn’t decide how they could go to the station.)
? I found it necessary to talk with him again.
? He felt it a pity not to see his former teacher at the party.
【Note】(1) The infinitive follows a predicative adjective as Object in the middle sentences.
(2) The infinitive used as object with the i
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