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1.动词不定式一般式表示的动作可能与谓语动词的动作同时发生,也可能在其之后发生。例如: saw the young man enter the house.(同时发生)

  I hope to go there next time.(之后发生)

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例1
________ is one thing, ________ is quite another.
 
A.
To say, to do
B.
Say, do
C.
Said, did
D.
To say, do
答案:
A
提示:
用动词不定式作主语。
例2
I’ll try ________ the same mistakes again.
 
A.
to not make
B.
not make
C.
not to make     
D.
not making
答案:
C
提示:
动词不定式的否定形式为not to + 动词原形 “try not to do sth.”意思为“尽力不做某事”。
例3
It’s too hard ________ it by himself.
 
A.
not to do
B.
to do
C.
that I do 
D.
doing
答案:
B
提示:
“too … to”是太 …… 而不能的意思。
例4
I have nothing ___________ (send) you.
 
答案:
to send
提示:
不定式短语to send you在这里做定语修饰nothing
例5
They were made ___________ (work) ten hours a day.
 
答案:
to work
提示:
在主动语态中make要跟不带to的不定式作宾语补足语,但在被动语态中make后的不定式须带to
例6
No one knows what ___________ (do) next.
 
答案:
to do
提示:
动词不定式和疑问词连用,构成动词不定式短语,在句中作宾语。

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5.  完成的被动式to have been done

例如:The boy is said to have been sent to hospital yesterday.

第二节 实战演练

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4.  被动式to be done

例如:The work is to be done soon.

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3.  完成式to have done

例如:He seemed to have cleaned the room.

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2.  进行式to be doing

例如:He seems to be reading something at that time.

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动词不定式是非谓语动词的一种,有不定式符号(to)加动词原形构成。不定式的形式有五种:

1.  一般式to do

例如:I like to read English.

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4.动词不定式与疑问词连用

疑问词who, what, which和疑问副词when, where, how, why等后面可以按动词不定式,构成动词不定式短语,可以在句子中作主语、宾语、表语等成分。

例如:(1) He doesn’t know how to use the machine.

                       (不定式作宾语)

        (2) How to use the machine is a question.

            (不定式作主语)

        (3) The question is when to go there.

               (不定式作表语)

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3.动词不定式的否定形式

动词不定式的否定形式not + to + 动词原形构成

例如: He asked me not to make such a mistake.

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6.    作状语

He stopped to have a look.

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