SHOULD/SHOULDN'T
You are late for work every day because you stay up late with your phone
You SHOULD put away your phone. You SHOULDN'T use your phone so late at night.
You forgot your best friend's birthday and he/she seems hurt.
You SHOULD apologize and buy a present. You SHOULDN'T forget next year.
You lost your wallet in the supermarket.
You SHOULD immediately call your bank. You SHOULDN'T waste time asking people if they have seen it.