I hear her sing this song的被动语态形式拜托各位了 3Q大哥大姐些,

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? 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 hear her sing this song的被动语态形式拜托各位了 3Q大哥大姐些, i often hear her sing a song变被动句 Can you ---(hear)her---(sing) I often hear her （）in her room . Ato sing BsingingI often hear her （）in her room .Ato singBsingingCsingDsings 改为被动语态when did you hear her sing this song We often hear her sing this song.(改被动语态） 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 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 hear her sing a song in the morning.如何变成被动语态? 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, 改为被动语态2You must take good care of the children3when did you hear her sing this song 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 sing in the next room.We must repair the computer now.（都改为被动语态）