willhavedone是什么时态

will have done是一般将来时完成时态，一般将来时(The Simple Future tense)表示将来某一时段的动作或状态，或将来某一段时间内经常的动作或状态。在英语时态中，“时“指动作发生的时间，”态“指动作的样子和状态。

I will have done it by the time you come back.

在你回来之前，我会做完它。

I shall/ will have done it before you come back tomorrow.

明天在你回来之前我会把这件工作做好。

I\'m afraid they will have done so by now.

我担心他们现在已经那样做了。

Then you will have done everything I asked.

你才做完所有我要求的事情。

There is no point bending down to pick up a$ 10 note because someone will have done it already.

弯腰去捡10美元没有道理，因为有人已经把钱捡走了。