I OFTEN HEAR HIM _ AN ENGLISH SONG ,AND YEATERDAY I HEARD HIM _ IN THE NEXT ROOM.

问题描述:

I OFTEN HEAR HIM _ AN ENGLISH SONG ,AND YEATERDAY I HEARD HIM _ IN THE NEXT ROOM.

第一个sing 表结果 只是听他时常唱歌而已
第二个singing正在进行的状态 昨天我听见他在隔壁正在唱歌