Dave's ESL Cafe's Student Discussion Forums

[Anninha]

Hi there!
Can 'should have done' be used to talk about possibility?

He should have arrived by then, it was 9pm and he always gets home before the evening news.

How about ' couldn�t have done?' Is it possible only to talk about impossibility [ just like can�t have done ] and lost opportunity ?

Or could it be used to express the following idea: he wasn�t supposed to study, but he did. [ he couldn�t have studied ]

What about will have done in the PAST?
when do I used it?

Thank you in advance. I hope you can help me out!
Anna