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