helen is singing in the next room .-It--be helen.she has gone to Beijing.a can not b must not c may

Listen!Helen is singing in the next room. Helen is good at singing. (同义句) Helen is good at singing一般疑问句 _____Listen!Helen is singing in the next room.___It ____be Helen.She has gone to Beijing.A.can'tB.mustn't helen is singing in the next room .-It--be helen.she has gone to Beijing.a can not b must not c may Iisten!Helen is singing in the next room.It ( ) be Helen.She has gone to Beijing.A.mustn't B.can't请说说musn't与can't的区别和用法 is helen in 改同义句 Helen is _____(well)at singing .She sings____（well)than any of us. S______ is singing in the room. the girl in red is Helen 对in red 提问----- -------is Helen The girl is Helen.Helen is in green合并为一句 can't 和 mustn't.1、-The sports shoes must be Linda's.-No,they ______ be .They're too small for her.2、-Who's the man over there?Is it Mr.Black?-It ____ be him .He's much taller.3、-Listen!Helen is singing in the next room.-It _____ be Helen.She the staffer said he did not know _____the meeting.a.when we started b.when will start c.when would start d.when to start答案及原因（详细）listen!helen is singing in the next room .it ____be helen,she is gone to beijing.a.can't I see a man behind me(改一般疑问句) helen is good at singing（同义句） someone is singing in the next room.同义句转换 ( ) ( ) someone singing in the next room who is singing in the next room 为什么who 后面要跟 is singing? 改错:Helen is doing well in PE than Nancy. Is Helen( )in the music room?(填空）