问题描述: All you have to do is do sth为什么是do sth?而不是to do sth? 1个回答 分类:英语 2014-10-04 问题解答: 我来补答 All you have to do is do sth=All [that] you have to do is do sth这是不定式的典型用法之一:作表语的不定式,前面有实意动词do的某种形式,要用省略to的形式. 展开全文阅读