Must I clean the blackboard now?No,you___clean it later A must B needn't C can D shouldn't都写上

Need I clean the room?与Must I clean the room?有什么区别 I must clean the room.改成被动语态 Must I clean the room now No you don't_______ ------Must I clean the room? 的肯定回答 must i clean the room nowno,you___mustn'tneedn't must i clean the classroom right now?No,you ( ) 用must,need提问用什么答如；must I finish my homework today?Need I clean the room now? you must clean the window对clean the window提问 I must help Tom clean the room.改为一般疑问句,并作肯定回答 Must I clean the room now (作否定回答） No,you _____ _______ _______ I must to go now.He musts clean the table now.改错 You must keep the bedroom ______(clean) We must ___(keep) the classroom clean. You must clean the classroom.(改为祈使句) i must____(clean) the classroom. ____ I clean the door?no,you ___.A.need;mustn't B.must C.may D.could I don't know.Must the medicine be kept cool,clean and dry?合并为一句 Must I clean the floor now?(A) No,you mustn't.(B) No,you needn't.并说明理由