it is kept in the room by us 和 it was kept in the room by us 和it is being kept in the room by us

问题描述:

it is kept in the room by us 和 it was kept in the room by us 和it is being kept in the room by us
具体意思有什么区别啊

你好,他们的意思区别如下 :
第一句表示:它目前被我们留在房间里,
第二句表示:它过去被我们留在房间里,
第三句表示:它现在正在被我们留在房间里.
除了意思,还有时态的区别
第一个是一般现在时第二个是一般过去式第三个是现在进行时