They can’t have been doing their homework,能不能改成下面句子

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• They can’t have been doing their homework,能不能改成下面句子
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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 ---doing是什么词性?have been 在这里还是表现在完成时吗
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