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英语
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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
人气：345 ℃ 时间：2020-02-05 17:48:38
解答
doing是do的进行式哈,不是词
have been doing是完成进行时,意即：他们不可能现在还在忙着他们的
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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?
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 have been doing their homework
用现在完成时可以吗?如：They have been invited to her birthday party.
有没有have doing这个说法?我们都知道现在完成时有have done 和have been done 两种用法,那么请问现在完成进行时中除了有have been doing外有不有have doing?
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