You must speak quietly. , You mustn't drink or eat. , You must return the books., You mustn't use your phone. , You must listen to the librarian. , You mustn't run. , You should drink water every day. , He should apologize to her. , They should save money. , She should listen to her friend's advice. , He should visit his parents more often., I should learn how to cook. , I have to be home by 10. , He doesn't have to call his parents., They have to finish their chores. , Lily has to learn to drive. , I have to go to the dentist. ,

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