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this afternoon.( 改為祈使句 ) Come here early this afternoon. her help you.( 改為否定句 ) Don’ t let her help you. has to listen to the teacher carefully in class.( 改為否定句 ) She doesn’ t have to listen to the teacher carefully in class. 。例如 : —Must I finish the work now?我現(xiàn)在必須完成這項(xiàng)工作嗎 ? —Yes,you must./No,you don’ t have ,你必須完成。 You don’ t hav