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