UC知道：想知道神马，提问回答学习问题百度都知道

I ____ playing tennis when Tom and George arrived.

来源：百度知道编辑：UC知道时间：2024/05/31 14:52:58

为什么空格处是had finished 而不是finished？？

在这里when的意思是“在......之前”，表示过去的过去，即过去完成。

这是说在tom跟george来之前我就停止打网球了

停止打网球的动作是发生在他俩来之前的

他俩来的时态是过去时再往后推一个时态就是过去完成时了

when Tom and George arrived.arrived过去式，你在他们来之前结束的，是过去的过去，用Had

这是因为在他们之前已经完成了时态先后问题故用完成时

I'm ____ my classmates,playing soccer on our school playground. Mary and Peter ____ playing. I spend ___ playing football . I spend ___ playing football .? I enjoy playing basketball as well I was definitely no playing video games. I was playing the piano when I was reading nespaper. I found the boy _____ at the cornerjust now.A.playing B.play C.was playing when I ____ there, I found that everything ____ ready i wish you ____ (successed)