当然能,have been doing就是现在完成进行时的结构.
如:I have been learning English since three years ago.
自从三年前以来我一直在学英语.
We have been waiting for you for half an hour.
我们已经等你半个钟头了(人还没到,如同在电话里说的,还会继续等)
当然能,have been doing就是现在完成进行时的结构.
如:I have been learning English since three years ago.
自从三年前以来我一直在学英语.
We have been waiting for you for half an hour.
我们已经等你半个钟头了(人还没到,如同在电话里说的,还会继续等)