作业帮HE ( ) in the classroom just now.he ( )be there now
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HE ( ) in the classroom just now.he ( )be there now
为什么答案是WAS HEARd TO SING , may 而不是was heard sing ,must
为什么答案是WAS HEARd TO SING , may 而不是was heard sing ,must
hear sb do sth/doing sth 的被动语态为：be heard to do sth/ be heard doing sth.所以前半句选be heard to do.
前一句话的意思是刚才听到他在教室里唱歌.后一句的意思是：他现在可能在那（即教室里）.因为刚才还在教室里唱歌,但现在可能在教室里,但也可能已经出去了.所以后半句用may(可能)而不用must（一定）.
前一句话的意思是刚才听到他在教室里唱歌.后一句的意思是：他现在可能在那（即教室里）.因为刚才还在教室里唱歌,但现在可能在教室里,但也可能已经出去了.所以后半句用may(可能)而不用must（一定）.
HE ( ) in the classroom just now.he ( )be there now
He was in the classroom just now.( )he in the classroom just
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he is in the classroom now.用yesterday改写句子
I was in the classroom just now.
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He wasn't ______(notice) to come into the classroom just now
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