Jack is supposed to have arrived half an hour ago. Jack ...
Jack should have arrived half an hour ago.
What would you advise me to do? (think)
What do you think I should do?
I'm sure that Liz hasn't met Harry before. It's impossible! Liz ...
Liz can't have met Harry before.
Heather possibly hasn't left yet. Heather...
Heather might not have left yet.
Do I need a different driving licence for a motorbike? Do I ......
Do I have to have a different driving licence for a motorbike?
It's possible for anyone to break into this house! Anybody .....
Anybody can / could break into this house!
David probably took your books by mistake. David ....
David must have taken your books by mistake.
Mary knows how to stand on her head. Mary ...
Mary can stand on her head.
You're not allowed to park here. You .........
You can't / mustn't park here.
I'm sure they haven't eaten all the food. It's not possible! They ....
They can't have eaten all the food.
Perhaps Pam and Tim decided not to come. Pam and Tim ....
Pam and Tim might have decided not to come.
I'm sure that Brenda isn't over thirty. Brenda.....
Brenda can't be over thirty.
I'm almost sure that Helen feels lonely. Helen.....
Helen must feel really lonely.
The dentist will see you soon. I don't think he'll be long. // The dentist will see you soon. He .....
He shouldn't be long.
I think it was the cat that took the fish from the table! The cat .....
The cat must have taken the fish from the table.
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.
It is a good idea for Harry to take a holiday. Harry...
Harry should take a holiday.
It was a mistake to park outside the police station. You ....
You shouldn't have parked outside the police station.
It was unnecessary for you to clean the floor. You....
You needn't have cleaned the floor.