在大学英语六级考试中，语法知识贯穿了整张试卷，如果语法知识薄弱，就会拉低自己的成绩，所以为了同学们能更好的学习语法重点，沪江小编为大家整理了一些基础语法知识供大家学习。今天我们来学习一下关于省to的动词不定式，希望可以为大家带来帮助。

省to的动词不定式

1) 情态动词 ( 除ought 外，ought to)：

2) 使役动词 let, have, make：

3) 感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作宾补，省略to。

注意：在被动语态中则to 不能省掉。

I saw him dance.

=He was seen to dance.

The boss made them work the whole night.

=They were made to work the whole night.

4) would rather，had better：

5) Why… / why not…：

6) help 可带to，也可不带to, help sb (to) do sth：

7) but和except：but前是动词do时，后面出现的动词用不带to的动词不定式。

8) 由and, or和than连接的两个不定式，第二个to 可以省去：

9) 通常在discover, imagine, suppose, think, understand等词后，可以省去to be：

He is supposed (to be) nice.　他应该是个好人。

举例：

He wants to move to France and marry the girl.

He wants to do nothing but go out.

比较： He wants to do nothing but go out.

He wants to believe anything but to take the medicine.

典型例题

1) ---- I usually go there by train.

---- Why not ___ by boat for a change?

A. to try going B.　trying to go C.　to try and go D.　try going

答案：D. why not 后面接不带to 的不定式，因此选D。

2) Paul doesn‘t have to be made ___. He always works hard.

A. learn B. to learn C. learned D. learning

答案：B. make后接不带to 的动词不定式，当其用于被动时，to 不可省略。

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