I often hear her sing this songsing不用第三人称单数吗?为什么不是时间是I often hear her sings this song

I often hear her （）in her room . Ato sing BsingingI often hear her （）in her room .Ato singBsingingCsingDsings i often hear her sing a song变被动句 I often hear her sing this songsing不用第三人称单数吗?为什么不是时间是I often hear her sings this song I often hear her _____ (sing)in the next room last year.为什么不能用singing? I often hear her _(sing) in the morning ,填什么?为什么 I often hear her ()english songsA sing B for singing C sings I often ____(listen to,hear) her reading in the room.急 I‘ve often heard her sing this song.与I often hear her sing this song.使用了完成时态,有什么不同的吗? you her do hear often singyou her do hear often sing连问句 将下列句子翻译成被动语态I often hear her play the piano.I heard her playing the piano just now.I watch them play the game. I often hear her ____________after class.A.to sing B.sang C.sing D.sings 为什么不是D I often hear the lonely girl sing in her room为什么中间用sing而不用sings啊 I often hear her sing in the next room.We must repair the computer now.（都改为被动语态） we often hear her singsing songs next door 改被动 It's possible for her _(not join) his party,because she is tird of him.I often hear the girl _(play) the violin in her room.Can you hear her _(play) at the moment? I often hear her sing songs in English in her room.这里的宾补为什么是动词原型,我能改成动名词形式吗? I often hear the girl-----next door.when ipassed the door,I heard her---just now.A.sing ;singing B sings:sing i often hear her （）after class.答案是sing,我认为应该填to sing啊,应为hear是动词sing也是动词啊退一步说,就算填sing也得加s啊,因为是her啊,