Can have + past participle?

[nq:1]Is such construction correct?[/nq]
No. 'Can' only works in present simple. If you want to use it in pp you're going to have to put it back into the past, and one fnction of 'could' is as a past form of 'can' in the same way that 'would' can function as a past form of 'will'. Alternatively you could use a pp form of 'be able to' + infinitive:-
'I've been able to dance since I was ten'

O czasie 2004-06-03 11:36, taki/taka jeden/jedna Django Cat wzia;/e;?(a) i napisa?(a) :
[nq:1]Only the second one works. 'I could have danced all night' or a conditionally one:- 'I could have told you that if you'd asked me'.[/nq]
how about:
'If we keep travelling, we can have seen all the European capitals by the end of this year.'

there's no kaangut. it's only yourself.

[nq:1]O czasie 2004-06-03 11:36, taki/taka jeden/jedna Django Cat wzia;/e;?(a) i napisa?(a) :[/nq]
[nq:2]Only the second one works. 'I could have danced all night' or a conditionally one:- 'I could have told you that if you'd asked me'.[/nq]
[nq:1]how about: 'If we keep travelling, we can have seen all the European capitals by the end of this year.'[/nq]
No. 'Can' doesn't work in the f

[nq:2]O czasie 2004-06-03 11:36, taki/taka jeden/jedna Django Cat wzia;/e;?(a) i ... all the European capitals by the end of this year.'[/nq]
[nq:1]No. 'Can' doesn't work in the future, either. You have to use 'be able to':- 'If we keep travelling, we ... describe this as the 'future perfect tense', but see Cyber Cypher's post under 'how many tenses...', which I agree with.[/nq]
Wouldn't y

[nq:2]O czasie 2004-06-03 11:36, taki/taka jeden/jedna Django Cat wzia;/e;?(a) i ... all the European capitals by the end of this year.'[/nq]
[nq:1]No. 'Can' doesn't work in the future, either. You have to use 'be able to':- 'If we keep travelling, we will have been able to see all the European capitals by the end of this year.'[/nq]
I'd say 'If we keep traveling, we can see all the capita

[nq:2]Is such construction correct?[/nq]
[nq:1]No. 'Can' only works in present simple.[/nq]
Not true.
John is competing in an eating contest most hot dogs in ten minutes. He deliberately paces himself to eat a maximum of three per minute; otherwise he gags. The starter fires the starting gun and wanders off behind the platform where the contest is being staged. An eating-contest fan en

[nq:2]No. 'Can' doesn't work in the future, either. You have to use 'be able to':-[/nq]
I disagree I think the above, with "can" in the present, is fine.
[nq:2]'If we keep travelling, we will have been able to see all the European capitals by the end of this year.'[/nq]
That's correct too, but it describes a possibility that will apply at the end of the trip, if the intention to keep t

[nq:1]"can have seen" 643 "will be able to have seen" 6 "can have done" 3,470 "will be able to have done" 7[/nq]
You really need to rake through these a bit to see if they really are being used in the way you suggest. Out of the first few pages of 'can have seen' hits, only one struck me as semi-valid. It was from a translation of a novel by a Swedish writer. Even here, 'could have seen' would

[nq:1]Still, it's surprising common. I wonder if I'd notice if someone slipped such a formation into everyday speech. If I don't pay attention, by theend of the day I can have heard someone use it without even noticing.[/nq]
Having posted this, I poked around a little more.
Google for "can have heard" site:edu, and ther're hits from the likes of J. Bentham & Henry James. Another interestin

zbihniew wrote on 03 Jun 2004:
[nq:2]Only the second one works. 'I could have danced all night' or a conditionally one:- 'I could have told you that if you'd asked me'.[/nq]
[nq:1]how about: 'If we keep travelling, we can have seen all the European capitals by the end of this year.'[/nq]
No. That's not idiomatic AmE, anyway.
If we keep traveling,
A. we will be able to see all t