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Would you mind if you explained the difference between can/can't have+V3 and must/mustn't have+V3?

Are they the same structure? Why?

Thanks in advance.
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Comments  
Jet LiWould you mind if you explained the difference between can/can't have+V3 and must/mustn't have+V3?.
Correction: Would you mind explaining the difference between can/can't have+V3 and must/mustn't have+V3?.



Comment: You can't have seen him. = It's impossible that you saw him.

You must have seen him. = It's impossible that you didn't see him.

You mustn't have seen him. = The only explanation is that you didn't see him.



You can't have lost it. = It's impossible that you lost it.

You must have left it at home. = The only explanation is that you left it at home.

You mustn't have left it at home. = The only explanation is that you didn't leave it at home.
Myprofe
Jet LiWould you mind if you explained the difference between can/can't have+V3 and must/mustn't have+V3?.
Correction: Would you mind explaining the difference between can/can't have+V3 and must/mustn't have+V3?.
No, Jet Li is correct.
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Myprofe is a 57 year old native English speaker with over 25 years of experience teaching English as a foreign language. He should know what he's talking about. But you don't have to trust him. You can get another opinion [url=http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv239.shtml ] here[/url].
Oh my God -- pride is an abomination.
Do you mean you are always right?
Myprofe, no need to get shirty just because someone doesn't understand your point. It would have been more helpful to explain to them the reason why you made the change.

Jet Li and Inch.

Would you mind if you explained- this means would you object if you were to explain....

Would you mind explaining - this is a polite request to explain
Students: Are you brave enough to let our tutors analyse your pronunciation?
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Must is used with the perfect infinitive (have + past participle) to express certainty about the past.

Edna isn't in her office. She must have gone home.
(=It seems certain that she has gone home)


Swan, Practical English Usage, must
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Nona The BritWould you mind if you explained- this means would you object if you were to explain....

thanks Nona -- this is what was in my mind too, although I am not a native and have only been learning English for a mere 3,5 years.
I think my message is clear. I didn't say I was proud or that I was always right. In fact, I'm learning things about English every day. The best way to learn is by teaching. You say that what Jet Li wrote is correct and give no explanation. Why should he believe you and not me?

I'm here to offer my help. What's your first language? If it's not English maybe you were taught this wrong. In Spain many people end a letter with, "I look forward to see you" instead of "I look forward to seeing you" and they challenge me when I try to correct them because they've learned it that way and they've seen it written that way. If everybody is wrong that doesn't make it right.
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