have been doing 的用法,
问题描述：
have been doing 的用法,
My borhter has worked in that factory since two years ago
问：不是have been doing吗,为什么会是has worked,余很笨,
答
相同：
1：现在完成时（have done)和现在完成进行时(have been dong）都可以表示从过去某一时刻开始一直延续到现在的动作.Example:
I have worked in this school since 2000.
I have been working here since 2000.
2:现在完成时和现在完成进行时都可以表示一段时间内延续的动作.Example:
Mr.Smith has lived here for 20 years.
Mr.Smith has been living here for 20 years.
以上句子用现在完成时和现在完成进行时,含以上没区别,两种时态可互换.但两种时态也存在用法上的差别.