It couldn’t have been John because he’s in London.
He drives a Ferrari. He must be rich
The plane should be landing any time now.
He has studied very hard. He ought to pass.
She will have plenty of time to get there.
PROHIBITION
You mustn’t eat any more chocolate.
You should never repeat what you have just said.
ADVICE
You should go to the doctor’s tomorrow. .
You must go to the doctor’s tomorrow! (emphatic advice)
Semi- modals and other forms are often used. However, they sometimes change the level of intensity of the advice given.
You ought to/had better/have to/ . . . . . .
If I were you I would go to the doctor’s.
NECESSITY
We must buy some more vegetables.
Semi-modals (have to/need to) are often preferred. NOT NECESSARY uses don’t have to or don’t need to/ needn’t
We don’t need to buy any more vegetables. (It isn’t necessary)
A REQUEST Can I go to the cinema tonight? Could you lend me £5, please? May I leave the room? Would you please close the door?
SPECULATION
He may have gone to Spain with Mary.
Someone might have already told his father.
What would I have done without you?
Where shall/will we be this time next year?
OBLIGATION
You must / have to study harder!
I should be studying but I’m too tired.
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