can’t have been和can’ have done有什么区别

can't have been和can' have done有什么区别
或者must have been和must hane done;may have been和may have done

can t have done 表否定推断,推测肯定没做.The measurement couldn t have been wrong.测量不可能出错了.He can t have been to that town.他根本不可能去过那座城市.He can't have taken it home.他不
“can’t have done”表否定推断,推测肯定没做.
The measurement couldn’t have been wrong.
测量不可能出错了.
He can’t have been to that town.
他根本不可能去过那座城市.
He can't have taken it home.
他不可能把它带回家了.
“can’t have done”表“不可能”.
“mightn’t have done”表“可能不”.

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