I often hear the lonely girl sing in her room

I often hear the lonely girl sing in her room 将We often hear the girl sing happily in her room改为被动语态 I often hear her sing in the next room.We must repair the co I often hear her _____ (sing)in the next room last year. I often hear her( )in the next room.a/sing b/is singing c/to I often hear him _____ ( sing ) in the next room. We often hear her sing in the next room中为什么用sing而不用sings I often hear her （）in her room . Ato sing Bsinging she ( ) often ( )【hear】to sing in her room ①宾语补足语随什么人称而变?例如：I often hear her sing in the room.里面的sing随I I often hear her sing songs in English in her room.这里的宾补为什么是 I often hear him _____ ( sing ) in the next room.为什么答案上要求加in