deduction

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moniki

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Hello, I have a doubt about using the word "can" for deduction, when should I use "can't have" or "couldn't have"? Thanks in advance.
 

paul.moss

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In this sense and in the negative, no difference. Both are the past negative forms of must: He must have been joking/he can't /couldn't have been joking.
 

moniki

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Thank you a lot.:)
 
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