4.to替代整个动词不定式

当某个动词不定式词组在句子中再次出现时，我们可以只用to这个词，而不必重复整个动词不定式词组。(参见动词不定式)

I went there because I wanted to(=．．because I wanted to go there)．

我去了那儿因为我想去。

Perhaps I'll go to Brazil this summer，I'd very much like to．

也许今年暑假我要去巴西，我太想去了。

I think he should get a job，but you can't force him to if he's not ready(to)．

我觉得他应该找一份工作，但是要是他没有做好心理准备的话，你就不要强迫他了。

I don't dance much now，but I used to．

我现在不怎么跳舞了，但是我以前常跳。

He'll never leave home;he hasn't got the courage(to)．

他是不会离家出走的，他没有这个胆量。

提示：

有时to可省略，尤其是在形容词和名词之后，如在上面的某些句子中，虽然在want，wish和would like之后通常不能省略to。

×You asked me if I had time to join in the discussion，I would like，but I have something urgent to do．

然而，当want，wish和like用于由when，if，what，as和than引导的从句中时，to常常省略。

Come when you want．

想来的时候就来。

I've decided to do what I like．

我已经决定做我想去做的事。

Winning a scholarship gave him the chance to go to a college in one of the northern states，where black people had equal rights and were free to live，study and work as they wished．(人教大纲版高二下第28页)

他得了一次奖学金，这使得他有机会到美国北部的一个州去读大学。在那里黑人享有平等的权利，他们可以根据自己的意愿自由地生活、学习和工作。

In his youth Charles Darwin enjoyed all the freedom to experiment and do whatever he liked．(人教大纲版高三第34页)

查尔斯·达尔文在年轻时就享有做实验的充分自由，自己想干什么就干什么。

The rich could do as they liked，while the peasants suffered．(人教大纲版高三第197页)

富人们可以为所欲为，然而农民们却遭了殃。