All i have to do is learn english.为什么不在is后面加一个to? is 后面的learn为什么不用ing形式呢

2025年02月28日 23:04
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下列句型中,be动词后的to可以省略,改接原型动词做表语。
All I have to do is (to ) take a good rest.(你所要做的是好好休息)
All I can do is (to)wait.(我所能做的就是等待)
What you should do is simply (to) apologize to him.
(你应做的事就是向他道歉)
All I did yesterday was (to) eat and sleep.(我昨天做的事就是吃和睡)这些句子前都含有do的某一形式,所以可以省略后面to do中的to。
All i have to do is learn english也是一样