must - I must finish the exam., mustn’t - He mustn’t break any dishes., have to - I have to bring the dessert to a dinner party., don’t have to - She doesn’t have to respond to the message right away., need to - They need to leave the party by 10 p.m., don’t need/needn’t - You don’t need to apologize for his mistake., should - She should study to get a scholarship., shouldn’t - He shouldn’t play for long periods of time., ought to - You ought to make things right with your friend., ought not to - They ought not to throw out trash on the street.,

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