we heard the girl _(sing)at this time yesterday ,中间填?为什么?

we heard the girl _(sing)at this time yesterday ,中间填?为什么? I heard the girl ___(sing) in her room at this time last nig i heard he （）（sing）at that time.为什么填was sing We at this time yesterday we heard her sing at the part last sunday we heard her sing at the party last sunday this is the girl .yesterday..填啥? The girl wasdoing her homework at this time yesterday(改为一般疑问 I heard the girl---（ sing)in the nest room yesterday evening we often hear the girl sing this song转被动 We often heard the girl sing the English song in the next ro (句型转换)We often heard the girl sing the English song in the n