have been doing是什么時態

　　例句：

　　I have been waiting for you for almost 2 hours.

　　我一直在等你，快兩個小時了。

　　Where have you been hiding?

　　你都跑到哪去了？

　　Who has been making trouble?

　　是誰一直在搗亂？

　　We have been looking all over for you.

　　我們到處在找你。