i heard her singing.i heard her sing.有什么不同啊?

i heard her singing.i heard her sing.有什么不同啊? I,passed,heard,her,when,I,singing,by.(连词成句） I heard her singing in the next room ___ ___ ___ ___in the next room 是I heard her singing对还是I hear her singing对如果第一个对为什么要加过去态呢 一个英语问题 I heard her singing an English song when一个英语问题I heard her singing an English song when I passed by her room yesterday.请问为什么时间状语前面可以用进行时? 主动变被动1.I heared her sung an English song just now.2.I heard her singing an Englishi song when I passed by her room yesterday. I heard him singing there改被动句是heard singing还是heard to sing I heard she was singing in the next room then.(同义词) I__ her __ in the next room thenRT 英语改为被动语态I heard her singing at8：00 last night.She at8：00 last night. 英语非谓语选择题i sat near her and heard her_____ the new songA.sing B.singing I heard he is singing.是病句么?能不能改为I heard that he is singing. ---- Where`s Mary now?Do you know?---- No,but I heard ____ in her room a few minutes ago.A.A.her singing B.her sing C.she was singing D.All the answers are right I singing someone doing heard my honework while was I I often hear the girl-----next door.when ipassed the door,I heard her---just now.A.sing ;singing B sings:sing --Did you hear her singing this pop song this time the other day?--Yes,and I heard this song.--Did you hear her （singing） this pop song this time the other day?--Yes,and I heard this song （sung） in English.为什么填 singing；sung? I heard someone is singing.(改为简单句) I heard her singing in the next room just now和Do you mind my opening the door中两个动名词作什么? I heard him singing改为被动语态which is correct?then I heard him sing?