sorry _ i must clean the classroom.1:i'm on duty today.2:let me help you.3:that's easy.4:i can find you there after school填那个

sorry _ i must clean the classroom.1:i'm on duty today.2:let me help you.3:that's easy.4:i can find you there after school填那个 根据上下文补全对话Hello!Hello!May I _ _ Mike?This is Mike _.Hi,Mike.This is Tom.Shall we go and _ football?Sorry.I must stay _ bed and _ a rest._ wrong _ you?I've _ a bad cold.Oh,I'm _ _ hear that. 对不起我没时间 Sorry,I _ _ time. I'm sorry I forgot to clean the classroom为什么I‘m sorry不是I was sorry forgot是forget的过去式,为什么clean不用过去式 Need I clean the room?与Must I clean the room?有什么区别 (1/2)We must ask Tom to clean his room again Tom _ _ _ to cle 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 ( ) Sorry ,I must be on you ,will be I must say sorry for the delay.保持原意I must?the delay. Sorry,I can do _(something)to help it. I'm reslly sorry _(break) your watch.急 Sorry I didn't turn up.I ___ forgot.A：clean B：cleanly must i clean my room now ?---no, you ___ .but you must clean it tomorrow .A.must B. mustn't C.need D.needn't写解释 用must,need提问用什么答如；must I finish my homework today?Need I clean the room now?