Obligation : You must wear a seatbelt. , You mustn’t drink and drive. , Children mustn’t speak to strangers. , My mom says I must clean my room before going out tonight. , Necessity: I must finish this tonight. , You must try this new face cream., I must clean the fish tank today. , I must pack for my trip tonight. , Certainty: He must be tired after his eight-hour trip., Pao must be tired of modal verbs by now. , My mom must be tired after all the cleaning she did., My friend must be sad after her boyfriend broke uo with her.,

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