1
You ___ wear a seatbelt while driving.
Must
You ___ have told me about the problem earlier. Now it’s too late.
Should (criticism about the past)
She looks exhausted. She ___ have been working
Must
Correct the mistake
He must to finish the report today.
He must finish the report today.
They ___ be at home. The lights are off and no one is answering.
can’t
(strong negative deduction)
We ___ leave now if we want to catch the train.
had better
Rewrite using a modal verb
I’m sure he didn’t understand the instructions.
He can’t have understood the instructions.
Rewrite using modal perfect
It was possible that they missed the bus.
They might have missed the bus.
You ___ park here. It’s strictly prohibited.
mustn’t
She looks exhausted. She ___ have been working all night.
must