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

i heard her singing.i heard her sing.有什么不同啊? I heard him singing there改被动句是heard singing还是heard to sing 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 I heard he is singing.是病句么?能不能改为I heard that he is singing. I,passed,heard,her,when,I,singing,by.(连词成句） I heard her singing in the next room ___ ___ ___ ___in the next room 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 them sing in the classroom.是对的,为什么I heard them singing in the classroom.不对?正在唱歌不应该用singing吗? 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 him singing in the hall.的宾补结构是哪一个? 1.when i walked past her room,I heard her ()an english songs A,singing B,was singing c,sang2.most girls (are scared of )the snakes.中scared表过去吗?那为什么be动词不用变?1,可这不是过去进行时吗？我选的B正确答案A为何？ 快,重赏1.when i walked past her room,I heard her ()an english songs A,singing B,was singing c,sang正确答案A,可这不是过去进行时吗?我选的B正确答案A为何?2.most girls (are scared of )the snakes.中scared表过去吗?那为什么 ---- 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