2015年职称英语考试已经开始备考，本阶段应该多整理一些基础词汇和语法。为此，网校特整理了“2015年职称英语考试语法知识”供您参考，希望对您有帮助！

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。