I often hear him paly the piano at home.里面的那个play啊..为什么不要-s啊?!him不是第三人称单数么?!这样写什么意思啊?!

I often hear from my pen pal .I often ____ ____ ___ ____ my pen pal .I often __ __ __ __ my penpal I often hear him ( ) in the room I often heard him ( ) in the room I often hear him _____ ( sing ) in the next room. I often hear him _____(cough)when I pass his room. Mike is my pal.I often help him with( )Chinese.Jeff studied hard and got( )grades than before. Does your pen pal often write to you Yes.I get a letter him every two weeks. I have (hear) of him.We often hear Jay,but we didm't hear Him.A,of,from B,from,of C,abou I OFTEN HEAR HIM _ AN ENGLISH SONG ,AND YEATERDAY I HEARD HIM _ IN THE NEXT ROOM. I often hear him sing the song in the room.变为被动语态 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ing? 把I often hear him play the piano all day 改为被动语态 I often hear him ( )the pop songs .A sing B sings C singing D to sing I often hear him sing the song.的被动怎么变 I often hear him sing the same song被动语态He ____ often ____ ____ sing the same song. I often ____(write) letters to my pen pal. I often hear him paly the piano at home.里面的那个play啊..为什么不要-s啊?!him不是第三人称单数么?!这样写什么意思啊?! I didn't hear from him