I'm certain that the girl on the sofa is wearing my jacket. The girl on the sofa............ my jacket. (must)
Must be
It's possible that my brother has bought a new phone. My brother.......................... a new phone. (could/ buy)
could have bought
She ................. (can't/ must ) be our teacher, she is only 19.
Can't
I'm convinced that your brother has forgotten my birthday. Your brother ................... my birthday. (must)
must have forgotten
They ...........(must / can't ) have heard some bad news, they looked very shcoked.
Must
It's not possible that my friends have seen this film. My friends............ this film. (can't)
Can't have seen
I think it's likely that the film will be a success. The film................. a success. (might)
might be
You ................ (have to / can't) be telling the truth, I don't believe a word of what you are saying
Can't