having been doing表示主动么?
having been doing表示主动么?
having been done 是主动还是被动,为什么have 出现having ing形式?分词是表示主动吧?看看这
to having been doing 和having been doing 的区别
had been doing是主动还是被动
doing having done being done having been done 造句!
to have been doing 和 having been doing 有什么区别,重点是have 和having
having been done是主动还是被动还是什么?
have been done 与 having been done 与have been doing与having be
have been done和have been doing 和having been done和having done
doing的形式:doing,being done,having done,having been done有什么区别?
有没有having been doing这样的呢?
having been done have been done have been doing 区别?就是have 和h