情态动词+have done地用法
问题描述：
情态动词+have done地用法
答
Tom is late, he must have missed the early bus!
答
这属于将来完成时的用法:表示到未来某个时间可能完成的某动作.
She'll have finished reading the book by the end of this month
We'll have learnt 1,200 words by the end of the year