小学英语不定式用法总结
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2021年01月31日 23:57
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不定式作主语
1)
It's easy (for me) to do that.
我做这事太容易了
easy,
difficult,
hard,
important,
possible,
impossible,
comfortable,
necessary,
better;
the first,
the next,
the last,
the best,
too much,
too little,
not enough
It's so nice to hear your voice.
听到你的声音真高兴。
It's necessary for you to lock the car when you do not use it.
当你不用车的时候，锁车是有必要的。
2) It's very kind of you to help us.
他帮助我们，他真好。
Kind,
nice,
stupid,
rude,
clever,
foolish,
thoughtful,
thoughtless,
brave,
considerate(
考虑周到的
),
silly,
selfish(
自私的
)
例句
:
It was silly of us to believe him.
我们真愚蠢，竟然相信了他。
It seemed selfish of him not to give them anything.
他不给他们任何东西，这
显得太自私了。
注意：
1)
其他系动词如，
look
，
appear
等也可用于此句型
2)
不定式作为句子成分时，动词用单数形式。
3)
当不定式作主语的句子中又有一个不定式作表语时，不能用
It is
…
to
…的句型
(
对
)To see is to believe.
百闻不如一见。
(
错
)It is to believe to see.
不定式作状语
1)
目的状语
To
…
only to (
仅仅为了
),
in order to,
so as to,
so(such)
…
as to
…
(
如
此……以便……
)
He ran so fast as to catch the first bus.
他飞快地跑以便赶上第一班车。
I come here only to say good-bye to you.
我来仅仅是向你告别。
2)
作结果状语，表事先没有预料到的，要放在句子后面。
What have I said to make you angry.
He searched the room only to find nothing.
3)
表原因
I'm glad to see you.
典型例题
The chair looks rather hard, but in fact it is very comfortable to ___.
A. sit
B. sit on
C. be seat
D. be sat on
答案：
B.
如果不定式为不及物动词，其后应有必要的介词。
当动词与介词 连用时，常
位于
形容词
+
动词不定式
结构的末尾。
不定式作补语
1)
动词
+
宾语
+
不定式
(to do)
advise
allow
appoint
believe
cause
challenge
command
compel
consider
declare
drive
enable
encourage
find
forbid
force
guess
hire
imagine
impel
induce