I heard him singing改为被动语态which is correct?then I heard him sing?

I heard him singing there改被动句是heard singing还是heard to sing I heard him singing when I pass his room.改被动（主语为he） I heard him singing改为被动语态which is correct?then I heard him sing? when I walk p__ his room,I heard him singing.填什么 I heard him singing in the hall.的宾补结构是哪一个? I heard Amy singing in the next room just now怎么改被动语态? I heard him ____ (sing) when I passed his room填什么、、、、老师说应该填singing、、我觉得应该填was singing呢 I heard he is singing.是病句么?能不能改为I heard that he is singing. We heard him ________in the next room last Saturday A singing B sang C is singing Who heard him singing in the next room?(被动语态)_____ _____ ______ he heard singing in the next room? I singing someone doing heard my honework while was I I hear him singing songs next door. 适当形式填空 I heard him （ ）(sing)in the next room.答案写的是sing,但为什么不写singing呢? i heard him ()in the next room a few minutes ago.sing;to sing;singing;sang,应该选哪个?有ago是不是应该选一般过去时? I heard someone is singing.(改为简单句) 如 At 7 oclock YESTERDAY evening i heard him _____ (唱歌） in the next room 此题答案为什么是singing 如果是过去进行时的话那不应该是 was singing i heard her singing.i heard her sing.有什么不同啊? I've never heard of him before.