1) You a) must smoke in the airplane b) mustn't smoke c) don't have to d) doesn't have to e) does must smoke 2) I a) mustn't study to learn English b) must study to learn English c) don't have to study to learn English d) doesn't to study to learn English e) does study 3) I a) have to go to school at 8 b) must go to school at 8 c) mustn't go to school at 8 d) don't have to go to school at 8 e) haven't to go to school at 8 4) You a) mustn't speak during the test b) don't have to speak during the test c) must speak during the test d) doesn't have to speak during the test e) have to speak during the test 5) You a) mustn't go to school on Sunday b) don't have to go to school on Sunday c) must go to school on Sunday d) have to go to school on Sunday e) doesn't have to go to school on Sunday

Modal verbs

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