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14 Correct the mistake in each sentence. Use 8A-8D in the Grammar reference to help you. a Do you must use your mobile phone in here? I don't like it. b He was angry that he must stop talking in last night's meeting. c I must to go to the doctor yesterday. d We shouldn't talk in here, don't we? e She cans not drive along this street. f You don't need be worried. g You had better not to play loud music at your party. h You needn't to worry. i You ought not drop litter. You shouldn't to put up posters here.​