前有do后无to的用法

（1）连词连接两不定式前面的有do后面的to do的to省略，如：

Tom have no choice but to give it up. 短语： have no choice but to do

在nothing but句型中,有do无to是指nothing 前有do的任何形式出现,but后的动词前就不能出现to,如:

He did nothing but piddle away the time.他不做事，只是混日子。

He could do nothing but stand and wonder.他只得惊奇地站著不动。

Now I want nothing but to go off to the Western Hills.

This man lives for nothing but to gather money.这个人的一生除了聚财以外别无目地。Jim chose nothing but to buy a basketball that morning.

（2）用is连接，不定式作表语时前面主语有do时后面表语to do的to省略，如：

What I want to do is stay at home.

What I want to do next Sunday is see mygrandparents .

The only thing that he can do is wait.What I want is to stay with you.

Jimdoes nothing but play basketball in the morning.

I have nothing to do but watch TV all day long. 短语：have nothing to dobut do….

（3）注意这里说的前有do后无to的前面的do要是实意动词do,不能是助动词do 自测题：

1. He did nothing but ____. A.sleeping B.to sleep C.slept D.sleep

2. He said nothing but ____there. A.stood B.stand C.standing D.to stand

3. I have no choice but ____ up this badbehavior. A.give B.to give C.giving

D.given