什么时候when sb do sth 可变成when doing sth
什么时候when sb do sth 可变成when doing sth
when sb.do sth.还是 when sb.doing sth.
when sb doing sth,sb doing sth 这个句型可不可以?
用 Sb who do sth be like sb else doing sth else who,when/once
when的结构,不是时间状语从句,不是现在完成时,是when sb do sth,还是when sb doing sth
when while and see sb doing sth
when doing sth 还是 when do sth (语法问题)
sb was doing sth when sth +动词过去式是什么时态
be doing sth.when
什么时候用see sb doing sth,什么时候用see sb to do sth
Let sb(do/doing)sth
Find sb doing/do sth