have been doing sth
have been doing sth
have been doing sth是什么时态?
have(has) been doing sth 造句写翻译
Have/has been 后一定要加doing sth.吗?
have been doing sth和现在完成时有区别吗?
请问是否存在have been being doing sth.
I have been doing sth.和I have done sth.有何区别?
has been doing sth+介词
have trouble doing sth
have fun doing sth.
have fun doing sth
have sb doing sth