negative deduction

Hello again,

I have a question about negative deductions about present events.
I know this sentence is correct: You can't be hungry. You have just had lunch.

But can I use verbs other than 'be' to imply negative deduction about present events?

Eg: You can't know my brother. He lives abroad. (It is impossible that you know my brother.)
He can't have two brothers. I am sure he has only one. (It is impossible that he has two.)
They can't live in the same block as I live. I have never seen either of them. (It is impossible that we live in
the same block.)
Etc.

Thanks.

Henry