MUSTN'T - PROHIBITION
SHOULDN'T - ADVICE
MUST - OBLIGATION
CAN - PERMISSION
CAN'T - IMPOSSIBLE
CAN - ABILITY
CAN - POSSIBILITY
SHOULD - ADVICE
CAN'T - PERMISSION
CAN'T - ABILITY
Students should pay attention in class.
Can I phone home? I don't feel OK.
You shouldn't go for a swim after a big meal.
Penguins can't fly.
People mustn't smoke in public places.
I can phone Sarah, I know her phone number.
If your arm is broken, you must go to the hospital.
Rafa Nadal can play tennis
You can't eat in class.
You can't know Sue's husband. She is single.
