ADVICES, You should call your grandparents more often., We should leave before the traffic gets bad., He shouldn't spend so much money on video games., You shouldn't stay up so late before an exam., RULES AND OBLIGATIONS, You must wear a helmet when riding a bike., Students mustn't use their phones during the test., We must leave now or we'll miss the train., You mustn't feed the animals at the zoo., NECESSITY, I have to finish this project by Friday., She has to work this weekend., You don't have to bring any food to the party., We don't have to wear a uniform on Fridays.

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