九年级英语Unit2语法。编者：刘老师851198991. used to do sth. 过去常常做某事否定形式：didnt use to do sth. / used not to do sth.如：He used to play football after school. 放学后他过去常常踢足球。 Did he use to play football? Yes, I did. No, I didnt. He didnt use to smoke. 他过去不吸烟。2. 反意疑问句 肯定陈述句否定提问如：Lily is a student, isnt she? Lily will go to China, wont she? 否定陈述句肯定提问 如：She doesnt come from China, does she?You havent finished homework, have you?提问部分用代词而不用
