They are always buying new cars. I'm certain they have a lot of money. MUST
They must have a lot of money
You are obliged to turn off your phone at school. MUST
You must turn off your phone at school
Tom has permission to go to the party. CAN
Tom can go to the party
I'm thinking about taking Japanese lessons. MAY
I may take Japanese lessons
I advise you to study harder. SHOULD
You should study harder
Perhaps, she is in Switzerland. MIGHT
She might be in Switzerland
I'm sure they will be home by now. MUST
They must be home by now
Tom knows how to speak Portuguese. CAN
Tom can speak Portuguese
I didn't have the ability to cook when I was younger. COULDN'T
I couldn't cook when I was younger
It's possible that the weather will be sunny tomorrow. MIGHT
It might be sunny tomorrow
I know that Jane isn't in London. CAN'T
Jane can't be in London
I advise you to go to the dentist. SHOULD
You should go to the dentist
It's possible that Jane will visit Australia next year. COULD
Jane could visit Australia next year
James definitely isn't 18 yet! CAN'T
James can't be 18 yet
It's forbidden to park here. MUSTN'T
You mustn't park here
I'm sure that Mrs Smith is at the library. MUST
Mrs Smith must be at the library