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They can’t have been doing their homework--句中“can't"是不是可以直接去

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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?
还有They can’t have been doing their homework能改成：
They haven't been doing their homework
They can’t have been doing their homework--句中“can't
They haven't been doing their homework 从语法上说这样是完全服合逻辑的.
至于They can’t have been doing their homework从口语上理论也算对的.如果是肯定式的话,can’t是完全可以去掉的.
祝你越学越精彩哦.
They can't have been doing their homework They can’t have been doing their homework ---doing是什么词性?have They can’t have been doing their homework,能不能改成下面句子 They can't have been doing thier homework.have been 是现在完成时,但 They have been doing their homework they don't doing their homework now. Don't have your children______for hours doing their homework The teachers are doing what they _____ their stuaits.A.can t 10、As they can't have a child of their own,they're going to He can't have been ill. 关于can't have been的句子 用can't have been造句!