I heard someone sing in the next room. 为什么用 sing

问题描述:

I heard someone sing in the next room. 为什么用 sing

hear sb. do sth. 听见某人做过某事。(强调动作的全过程)
hear sb. doing sth. 听见某人正在做某事。
本题的意思:我听见有人在隔壁房间唱过歌。

hear sb do sth 听到某人做某事.暗示过程完成
如果用I heard someone sing the song.就暗示 我"听完了整首歌.

hear sb.do sth.听见某人做某事
hear sb.doing sth.听见某人做某事的全过程