will have been doing是将来完成进行时.
如：By the end of next weekend,he will have been learning English for 3 years.
截至到下个周末,他就已经学英语学了三年了
而have been doing 是现在完成进行时.表示从过去到现在一直在做
I’ve been cleaning the house but I still haven’t finished
我一直在打扫屋子,但我仍然没有做完
will have been doing和have been doing的区别
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