改为被动语态：We heard him sing in his room just now

将下列句子改为被动语态!Who wrote this novel?We heard him sing this song. 改为被动语态：We heard him sing in his room just now We call him Xiaobao(改为被动语态) we heard them sing in shanghai 改为被动语态 I heard him singing改为被动语态which is correct?then I heard him sing? 将We often see him dance改为被动语态 we saw him walk into the classroom 改为被动语态 We often see him help his classmate.改为被动语态 改为被动语态,We ofen heard Mary sing in her bedroom. last sunday we heard them sing peking opra in that theatre改为被动语态 I saw him dancing.改为被动语态 Tom made him laugh.改为被动语态 we call him Lao Wang被动语态 we heared him sing the song in the next room 改为被动语态 we often hear him play the violin at home 改为被动语态 We have heard him sing改为被动语态.He ____ ____ ____ ____ ____ by us.hear 后面不是不可以加to do 不定式吗,请注意要填五个空！ I heard him sing in the classroom改为被动语态?someone say it should be modified likehe was heard to sing in the classroom.is that correct? 改为被动语态My mother looks after my little brother和We heard her sing the next room