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You must turn your phone off
OBLIGATION
You mustn't drink alcohol.
PROHIBITION
They can eat sweets.
PERMISSION
Adults don't have to sleep more than 8 hours.
LACK OF OBLIGATION / NECESSITY
Ann doesn't have to pay by cash.
LACK OF OBLIGATION / NECESSITY
He has to return the book to the library.
OBLIGATION
This dress doesn't suit you. You shouldn't wear it.
ADVICE
Mary Anne may have broken de law when she entered the abandoned house.
POSSIBILITY
George shouldn't have got involved in the fight.
ADVICE
They needn't have gone to the immigration office. They already had their record.
LACK OF NECESSITY
The man must have commited a crime.
CERTAINTY
She can't have felt any sympathy for him.
IMPOSSIBILITY
The major could have passed a law against drugs, but eventually he decided not to pass it.
POSSIBILITY
Ginnifer can't have known about the living conditions of her daughter.
IMPOSSIBILITY
Danny could have raised money for the poor children, but he got ill and couldn't go to the event.
POSSIBILITY
You needn't have cleaned the floor.
LACK OF NECESSITY
