What is said cannot be unsaid.

问题描述:

What is said cannot be unsaid.
这里面cannot可以变成can't吗?那个unsaid在这里是动词?cannot be的be 本身不就是动词了吗?后面为什么还能接unsaid这个动词?

cannot可以变成can't unsaid在这里是动词的过去分词相当于形容词,所以be unsaid是被动语态.What is said 是主语从句:被说过的话 cannot be unsaid是被动语态作谓语:不可能等于没说