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?

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? I often heard () (sing) in the room I heard him singing改为被动语态which is correct?then I heard him sing? Can you heard him ________________(sing)in the next room I heard him singing there改被动句是heard singing还是heard to sing I heard him sing a song in the next room just nom .(改为同义句）He ( ) ( )( ) sing a song in the next room just nom. 适当形式填空 I heard him （ ）(sing)in the next room.答案写的是sing,但为什么不写singing呢? i heard him ()in the next room a few minutes ago.sing;to sing;singing;sang,应该选哪个?有ago是不是应该选一般过去时? I heard him ____ (sing) when I passed his room该填什么?为什么这样填? 1、When I passed his room,I heard him （）（sing） 1 I heard him sing in the next room 2 The man gave me 10 books 3 She bought her month some gifts改为被动语态 I heard someone sing in the next room. 为什么用 sing 改为被动语态：We heard him sing in his room just now the,morning,I ,him,sing ,heard,song ,this .连词成句. The villagers had many trees ___ ( plant ) just then .They managed to make themselves ___ ( understand ) in very simple Eng .I heard the song _____（sing） in English .I heard her ___ (sing) the song in Eng.I saw him ___( open )the window .I saw th I often hear him _____ ( sing ) in the next room. I often hear him ( ) in the room I often heard him ( ) in the room I heard her ＿（sing） in the next room when I came back.