will have been doing和have been doing的区别将来完成时和现在完成时。有点混了，最好举几个例子，
问题描述：
will have been doing和have been doing的区别
将来完成时和现在完成时。有点混了，最好举几个例子，
答
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...