heard后面加动词的什么形式,为什么句子I heard the teacher talking

heard后面加动词的什么形式,为什么句子I heard the teacher talking While I was talking with my teacher,I heard the telephone ri be动词的用法问题I heard him singing.我听到他在唱歌.请问这句主语后面为什么不用加 be 动词,是什 主动的 受词后要加动词原形,那为什么someone heard the girl后面要用played呢? we often heard her sing in the next room 为什么动词不是ing形式的? I heard such a (用fun 的适当形式填空） joke yesterday.用什么,为什么? I heard them sing in the classroom.是对的,为什么I heard them singi i heard him （）（sing）at that moment.为什么填singing.老师讲的him加非谓语动词 I didn‘t 后面应该加什么形式的动词 什么动词前需要加be例如：I heard.I was worried about.怎么区分 heard 后加什么? 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