1. Robort is said ____abroad, but I don’t know what country he studied in.

 A. to have studied    B. to study

C. to be studying     D. to have been studying  (A)

2.AIDS is said ____the biggest health challenge to both men and women in that area over the past few year. 

A．That it is B.to be C.that it has been  D.to have been   (D)

不定式的时态形式一般包括三种：一般式、完成式和进行式。一般式表示的动作通常与谓语的动作（状态）同时（或几乎同时）发生，或在其后发生；如果不定式动作发生在谓语动作之前，要用完成式；同时发生时则用进行式；如果所说的动作发生于谓语动作之前，且一直在继续，则用完成进行式，不定式的完成式常用在be said(如上例)，be reported, be considered或appear, hope, pretend, seem等以及某些情态动词之后，表示对过去事情的推断或虚拟假设。例如:

I would love ____to the party last night but I had to work extra hours to finish a report.

 A. to go  B. to have gone  C. going  D. having gone

答案是:B。表示与过去事实相反的虚拟愿望。题干中的last night是选择判断的依据。不定式的进行形式也是一个值得注意的考点。

二、不定式的语态形式

当不定式的逻辑主语是其动作的承受者时，通常要用被动式。不定式的被动式在句中可做主语、宾语、表语、状语及宾补等。例如:

Little Tom would love ___to the theater this evening.

A. to be taken  B. to take  C. being taken   D. taking

答案是A。这里选择除了根据语境之外，还可以从take是及物动词，而后面无宾语加以判断。又如

He claimed ____in the supermarket when he was doing shopping yesterday.

A.     being badly treated  B. treating badly  C. to be treated badly  D. to have been badly treated

根据题意，本题该用不定式的完成被动式，表示动作发生在claimed之前，故答案是D。有时不定式用主动形式表被动意义。

三、不定式的否定式

其基本形式是not to do, not必须置于整个不定式结构之前。例如:

The patient was warned _______only food after the operation.

A. to eat  B. eating not   C. not to eat   D. not eating

答案是C.这道题并不难,只有熟悉其否定式和warn sb.(not) to do sth. 这个句型结构就能做对.

四、不定式的省略式

如果前面有一个类似的动词词组，那么在答句中的不定式符号to可用来代表此动词词组。例如:

----I’ll be away on a business trip .Would you mind looking after my cat?

----Not at all.____.

A.     I’ve no time  B. I’d rather not  C. I’d like it  D. I’d be happy to

答案是D。to 后省略了look after。不定式的省略现象，常出现在某些表示心里或情感状态的动词（如want, wish, hope, expect, love, hate, know, suppose, care, prefer, mean等和动词ask, tell, try, need等）之后，以及某些半助动词和情态动词 be to ,be  about ,be going to, have to, ought to, used to等之后。有时不定式符号to 也可一并省略，此不累赘。

五、forget ,remember,try, regret, mean, stop等动词后既可跟to 不定式又可跟动名词，须根据其习惯用法和语境选择  例如:

----The light in the office is still on.

——Oh, I forgot___.

A, turning   B, turn it off   C. to turn it off D. having  turned it off

答案；C. forget to do 意为“忘了（要）做（某事）” forget doing “忘了做过（某事）“”remember与forget 有类似的用法，还有try to do尽力做try doing试着做regret to say/tell很遗憾的说。Regret doing后悔做了某事。Mean to do意欲 /想要做。Mean doing  意味着做stop to do停下来做另一件事  stop doing 停止做某事，

The little time we have together we try wisely.

A. spending it   B. to spend it   C. to spend D. spending that

答案是C。填空处的意思是“尽量过得有意义 ”。

六．不定式表目的，

Helen had to shout ___above the sound of the music.

A.     making  herself hear  B. to make herself hear

C. making herself heard    D. to make herself heard

答案为D。Helen 只好大声喊，以便使别人听到自己的声音，因为后面谈到有音乐的声音。

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