She was ill,She can t have attended the meeting here为什么用can t have attended 而不用 could not be able to attend

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She was ill,She can t have attended the meeting here为什么用can t have attended 而不用 could not be able to attend
She was ill,She can t have attended the meeting here
为什么用can t have attended 而不用 could not be able to attend

She was ill,She can t have attended the meeting here为什么用can t have attended 而不用 could not be able to attend
could 怎么还和be able to 连用?
can't have done sth本身表示对过去情况的否定推测,意为：“根本不可能.”

这里是表肯定推测的。因为前面说啦她生病了，，所以她不可能去参加了那个会议的。你这种用法则翻译成：她生病了，所以她不能参加会议。。你感受一下。

She was ill,She can t have attended the meeting here.
本句是对她参加这里会议的怀疑.
她病了, 她不可能参加了这里的会议.(言外之意:说她参加了这里会议, 那是胡说八道.)

She was ill,She could not be able to attend the meeting here.
你建议的填法也不错,但是意思不同.
她病了, 所以她不能来参加这里的会议.

be able to 和can t 是相近的，而could not 只是can t 的委婉语气， could not be able to attend是一种重复表达

因为can not表示否定的猜测意思就是她生病了所以她肯定不会来参加会议的相同的表示肯定的猜测就用must

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