It was a waste of time worrying, after all! The fiance ....
The fiance needn't have worried after all!
I think it was the cleanerman that took the wallet from the office! The cleanerman....
The cleanerman must have taken the wallet from the office.
It was unnecessary for you to clean the floor. You....
You needn't have cleaned the floor.
Perhaps Ann and her fiance decided not to come to the office that day. Ann and her fiance ....
Ann and her fiance might have decided not to come....
I'm sure that Ann hasn't met the cleanerman before.
Ann can't have met Harry before.
The fiance possibly hasn't left Ann's office yet.
The fiance might not have left yet.
The cleanerman is supposed to have arrived half an hour ago before the murder.
The cleanerman should have arrived half an hour ago.
It would be a great idea if the cleanerman took a holiday. The cleanerman ...
The cleanerman should take a holiday.
You needn't come with me if you don't want to. You .....
You don't have to come with me if you don't want to.
I'm sure that the cleanerman feels lonely.
The cleanerman must feel really lonely.
It was a mistake to park outside the police station.
The fiance shouldn't have parked outside the police station.
It's possible for anyone to break into this office! Anybody
Anybody can / could break into this house!
I'm sure that the fiance threw the cigarette butt on the floor by mistake.
The fiance must have drunk.......by mistake.
I'm sure they haven't drunk all the bottle of wine. It's not possible! They....
They can't have eaten all the food.
I'm sure that Ann isn't over thirty.
Ann can't be over thirty.