文档介绍：非谓语动词
动词不定式是一种非谓语动词，由不定式符号to加原形动词构成，动词不定式保留着动词的一些特征：
(1)带宾语或表语。例如：
I want to watch TV.
I hope to be an outstanding student.
(2)可由状语修饰。例如：
I expect you to study hard.
(3)有时态和语态的变化。例如：
I’m sorry to have kept you waiting.（完成时）
The questions to be answered are on page 10.（被动式）
动词不定式和它的宾语，状语，或表语一起构成不定式短语。不定式或不定
式短语具有名词，形容词，和副词的性质，因而可以在句中作主语，宾语，表语，
定语，和状语。
在不定式符号to前加上not构成不定式的否定式。例如：
He told me not to touch the wire.
I.
To master a foreign language is very important.
Not to smoke will do you a lot of good.
To obey the laws is everyone’s duty.
动词不定式作主语时，常常用先行词it作形式主语，放在句首，将不定式移到谓语之后作实际主语。例如：
It is difficult to answer such a complicated question in English.
It has been possible to send man to space.
It takes the electronic computer only a few seconds to solve the problem. Example:
______ only five minutes to finish the task.
a. It took myself b. It required me c. It should be needing d. It took me
Our main task is to carry these building materials to the work site.
The most common way of getting heat is to burn fuel.
Our goal is to accomplish the modernization of agriculture, industry, national
defence, and science and technology.
Example:
My job ______ these children.
a. was to look after b. was looking c. is to looking after d. has looked
after
3．作宾语
begin, cease, choose, continue, decide, expect, fail, forget, happen,
hate, help, hope, intend, like, love, manage, mean, offer, plan, prefer, prepare,
promise, refuse, remember, try, want, wish 例如：
When did you begin to learn English?
Once you turn off the switch, electricity ceases to flow.
He promised to keep the secret for you.
Example:
Galieo planned to ______ the problem, but failed to do so.
a. solving b. have solved c. be solved d. have been solved
If you promise ______ angry with me, I’ll tell you what I broke.
a. get not b. not get c. not to get d. not getting
当不定式作直接宾语，它后面还有宾语补足语时，需用it 作形式宾语代替不定式，而把不定式放在补足语之后。例如