It's compulsory for us to wear school uniform. (have to), You aren't allowed to talk in the exam. (mustn't), It's important that I'm not late. (mustn't), It's important that you listen to me. (must), We are obliged to study maths at school. (have to), You needn't write the answer. (have to), It's important for Jake to revise hard for his exams. (must).

Modal verbs

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