have been doing ,have done 及其他现在时的用法及区别 please help me ,thanks.

HAV BEEN DOING STH为什么要加BEEN? have been doing sth what hav u been doing的been是干吗的?总觉得没必要. have been doing 神马意思? what you have been doing has been doing have been done区别 have been doing ,have done和have doing区别 i has been doing 还是i have been doing have been doing 为什么还有 have been deadj have been do和have been doing的不同 have been doing,had been doing,will have been down是什么 what have they been doing 是什么时态 have been doing sth是什么时态? have been doing 该怎么用 What have you been doing lately? should have been doing表示什么情况? We have been happy to continue doing 存在have been doing、have being doing、和have be doing吗?