最佳答案:must-Yes,you should./No,you needn't.need-Yes,you should/may/can/need./No.you nee
最佳答案:She dances nowShe doesn't dance nowDoes she dance now?Yes,she isWhat is she doin
最佳答案:1 Does he like beef?No,he doesn't.Yes,he does.2 Does she go to school every day?