I often hear him（）in the next room.（sing）

I often hear him _____ ( sing ) in the next room. I often hear him（）in the next room.（sing） I often hear him _____ ( sing ) in the next room.为什么答案上要求加in 一堆英语问题（一）1I often hear him ________ in the room 是填sing还是sing I often hear her sing in the next room.We must repair the co I often hear him sing the song in the room.变为被动语态 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 the lonely girl sing in her room I heard him sing a song in the next room just nom .(改为同义句） i often hear a boy （） the piano in the next room We often hear her sing in the next room中为什么用sing而不用sings