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英语
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They have been doing their homework
能改成：
he has been doing their homework 吗?
have改成了has
人气：485 ℃ 时间：2020-03-29 05:28:04
解答
he has been doing his homework
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They can’t have been doing their homework--句中“can't"是不是可以直接去掉,从语法上来讲没有错啊?
They can’t have been doing their homework ---doing是什么词性?have been 在这里还是表现在完成时吗
They can’t have been doing their homework,能不能改成下面句子
They have finished doing their homework(改写句子)
They can't have been doing thier homework.have been 是现在完成时,但是后面do为什么要变成doing?
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