0
Anonymous Posted 17 years ago
Grammar

Can have done

we use cant have done with the same meaning as couldnt have done .but I cant see positive form of 'cant have done' . I want to ask 'can have done' . Is there any grammar rule about this
  

Top answer

English is a language of fixed phrases. You can use it in a question: Can he have done that? CB

— Cool Breeze

  • English is a language of fixed phrases.
  • You can use it in a question: Can he have done that?
  • CB
Free · every Monday

Get the Weekly English Kit 📬

New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.

6 Answers
0
English is a language of fixed phrases. You can use it in a question: Can he have done that?

CB
0
0
thanks. in this sentence we use'can have done' with the same meaning as 'may have done',don't we?

did you have any idea about 'mustn't have done'
0
0
Hi masumface, and welcome to the forums. Glad you registered - it's a lot easier for us help you when we get to know you a bit.

It would be better if you wrote full sentences so we could see the areas of confusion.

If you see a big mess and say "Who did this?" you might can can answer:
Peter may have done this.

But NOT: Peter can have done this.

***
0
0
thanks for your quick answers.I m glad to register this forum.

I know the usage about 'cant have done' and 'must not have done'

I wanted to ask is there any usage about 'can have done' and I got the answer

i understood 'must not have done' in your example but I want to know if there is any usage about 'mustn't have done' ?
0
0
AnonymousIs there any grammar rule about this?
I don't think I've ever heard it stated as a rule, but in the affirmative "can have" + past participle is in the category of "not used" for some reason.

0
0
English is a language of fixed phrases. You can use it in a question: Can he have done that?


CB

i got this mail AND I am still confused about 'can have done'
0

Related Questions