※构成：have/has＋been＋现在分词
※用法：用来表示某一动作在过去开始，一直延续到现在，有可能刚刚结束，也有可能还要继续下去。
※与其连用的时间状语：
现在完成进行时常与for 2 hours, since 1986, all this morning, these few days 等表示一段时间的状语连用。如：
How long have you been skating?
What book have you been reading these days?
I’ve been sitting here for 3 hours. (I’ve=I have)
I have been collecting stamps since I was 10.
How long has he been collecting kites?
We haven’t been seeing movies for a long time.
She has been waiting for you all this morning.
