1.这是现在完成进行时态,表示从过去某时间发生的动作一直延续到现在,且正在进行（!）.又如：
I've been living here for 10 years.
2.by the way是插入语,表示“顺便问一声”、“顺便提一句”等.
By the way,how is your father doing?(顺便问一句,你爸爸好吗?）
by the way,what have you been doing.
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