eg: You may borrow my car.I won’t use it.

MUSTN’T= FORBIDDEN-PROHIBITED

EG: You mustn’t use your mobile in class.

MUST= OBLIGATION

EG: You must study hard if you want to pass your exam.

SHOULD/SHOULDN’T= ADVICE

EG: You look tired. You should sleep more.

Smoking is bad for you. You shouldn’t smoke.

NEEDN’T=IT’S NOT NECESSARY

EG: You needn’t bring your books tomorrow. We won’t use

them.

CAN= IT IS POSSIBLE FOR

YOU

EG: You can go out tonight, but promise to come back

home early.