How long have you been doing是什么时态的句子?这个时态怎样构成?
问题描述：
How long have you been doing是什么时态的句子?这个时态怎样构成?
答
现在完成进行时态
也就是进行时的现在完成时态
"been doing"是进行时
"have you done"是现在完成时态
(have been doing sth.)
How long have you been doing?
你像这样一直做了多久了?