-
最佳答案：may:yes,sb.may/canno,sb.may not/can'tmust:yes,sb.mustno,sb.needn't/mustn't(一般情况下
-
最佳答案：needn't
-
最佳答案：Could...do...Yes,...can.No,...can't.May...do...Yes,...may.No,...mustn't/can't/ma
-
最佳答案：no ,you needn't.
-
最佳答案：yes,you have to.must表示主观上的“必须”,have to表示客观上
-
最佳答案：must i have done it?------如果是这样的句型,那肯定是错的.应该是：-Must I do it ?- Yes, you must / N
-
最佳答案：Yes,you mustNo,you needn't
-
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：还有musn't,表示禁止做,肯定回答用needmay的肯定回答用may 否定用can'tneed的肯定回答用need 否定用needn't或don't nee
-
最佳答案：Must I do that?Yes,you must; No,you needn'tNeed I do that?Yes,you must; No,you n