I have to wear a shirt and tie at work.(=it's a rule in this company) - for general, public rules, I must buy a new shirt this one is too old.(= it's my own decision) - for specific, individual obligation, I love the Louvre! You must go when you're in Paris. You must see this film - it's amazing! - for strong recommendation, You don't have to drive we can get a train. - not strong, don't do if you don't want , You mustn't drive along this street. - negative rule , You should take warm clothes with you to Dublin. - give advice or an opinion,

have to, must, should

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