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单句改错,每句有一处错误.

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单句改错,每句有一处错误.
1、I found the book she lost three days before.
2、By the end of this year,the factory will produced 20000 tractors.
3、I studied English since I was ten.
4、We have been waiting for her for two hours by the time she came.
5、Is this the second time he breaks the world record in the field and truck events?
6、We didn't see him at the lecture yesterday.He mustn't attend it.
7、Xiao Li is so wet.She must fall into the lake.
8、He slipped into the room conen no one looked at him.
单句改错,每句有一处错误.
这些改错都是时态有关,
1、I found the book she lost three days before.(lost前加had,丢这个动作发生在found之前,所以过去完成时)
2、By the end of this year,the factory will produced 20000 tractors.(will后加have,到今年年底,这个工厂将会生产出20000拖拉机.将来完成时)
3、I studied English since I was ten.(studied前加have,since和完成时连用)
4、We have been waiting for her for two hours by the time she came.(have改had,她到来是个过去工作,等待应该是过去的过去,过去一直在等,所以过去完成进行时)
5、Is this the second time he breaks the world record in the field and truck events?(breaks改成has broken,第几次后应该加现在完成时)
6、We didn't see him at the lecture yesterday.He mustn't attend it.(mustn't改成couldn't或can't,对过去的推测应该用couldn't/can't have done,must表推测只能用在肯定句)
7、Xiao Li is so wet.She must fall into the lake.(fall前加have,must have done对过去的肯定推测)
8、He slipped into the room conen no one looked at him.(好像有错误啊,实在该不出来)