1.完成用法
[合作探究]
He has turned off the light.他已把灯关了。
He has already obtained a scholarship.他已经获得了一份奖学金。
This book has been translated into many languages.这本书已被译成多国语言。
These flowers have been watered，so you can go home.
这些花已经浇水了，所以你可以回家了。
[自主发现3]
(1)现在完成时的“完成用法”是指发生在过去的动作到现在为止已经结束，并且对现在产生了影响，与现在有因果关系。其特点是动作已经结束，不再延续。
(2)该时态常与already, yet, before, recently, never, this morning等时间状语连用。
