to be do是什么时态

　　We will be having a meeting to decide what to do.

　　我们将开会决定该做什么。

　　How long he'll be able to do so is a moot point.

　　他还能这样做多久是一个未知数。

　　We were rather hoping you'd be able to do it by Friday.

　　我们希望你最好能在星期五之前做这件事。