to-do和doing用法及区别Word版(5)

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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。

4.下面的动词要求加不定式to do做宾语

attempt企图enable能够neglect忽视

afford负担得起demand要求long渴望

arrange安排destine注定mean意欲，打算

begin开始expect期望omit忽略，漏

appear似乎，显得determine决定manage设法

cease停止hate憎恨，厌恶pretend假装

ask问dread害怕need需要