After a knock at the door ,the child heard his mother’s voic

2个回答

  • A 在英语中ing可表示伴随状态

    ed是过分 通常表示过去或者被动

    也可理解成是hear的用法如上一个人的回答

    但官方的理解应该是 ing表伴随

    下面有我找的例子

    She walked to school singing and smiling.

    He had to work standing.

    The old woman likes sitting there doing nothing.

    My mother is sitting on the sofa watching TV

    但也有特殊情况

    with+名词+动词ing 表示主动

    with+名词+动词ed 表示被动

    主动还是被动关键是看with后的这个名词是否能执行该动作,能做就是主动,不能做就是被动.

    例如:I left the house with all the lights turned off.灯与关的关系只能是被动,所以用ed形式.

    I left the house with my sister watchng TV.sister与watch的关系是主动,所以用ing形式.