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非谓语动词课件讲述
Non-finiteVerbs
Non-finite verbs
Gerund
Participle
Present Participle
Past Participle
Infinitive
Tense and Voice of Infinitive
active voice
passive voice
一般式
to do
to be done
进行式
to be doing
完成式
to have done
to have been done
完成进行式
to have been doing
(1).They pretended not to see us.
(2). He pretended to be sleeping.
(3).She pretended to have known it before.
(一般式表示与谓语的动作同时/发生在它之后.)
(在谓语动词发生的同时,不定式的动作也正在进行)
(完成式表示动作发生在谓语动作之前)
(4).The boy is said to have been playing the piano since he was three years old.
(完成进行式表示在谓语动词的动作之前一直进行的动作)
Exercises:
1. The policemen asked their identities ___
(keep) secret.
2.Ben is the only person in his town ___ (see)
the UFO.
3.The visitors are requested ___ (not, touch) the exhibits.
4. The old temple is said ___ (destroy) in a fire one hundred years ago.
to be kept
to have seen
to have been destroyed
not to touch
What function does the infinitive act in the following sentences?
1、The?infinitive?as?subject
To run is a good habit.(=It is a good habit to run.)
2、The?infinitive?as?predicative
Our plan is to build a bridge over the river.
3、The?infinitive?as?object
I want to buy a dictionary.
4、 The?infinitive?as?attributive
He has a chance to go abroad.
5、The?infinitive?as?adverbial
To finish the work, he had to get up early.
6、The?infinitive?as?object complement
I ask her to help him.
(1). 主语 Subject
不定式作主语时,往往放在句子的后部,用it作形式主语.
To get enough sleep at night is important.
It____________________________________.
It is adj. (for/of sb) to do sth.
It is + a pleasure/an honor/a pity to do.
It takes sb +time to do.
is important to get enough sleep at night
The usage of infinitive
1. 你太好了给我一些帮助。
It is very kind of you to give me some help.
2.和你一起共进晚餐很愉快。
It is a pleasure to have dinner with you.
It only took two years to complete the project.
3.完成这项工程只花了二年时间。
巩固练习1
(2). 表语 Predicative
My job
is
Your task ___
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