关于before和after的用法1.The roof fell __he had time to dash into the room to save his baby.2.Time passed quickly and three weeks went by _we knew it.答案都是before,我怎么觉得用after 也一样符合逻辑啊
问题描述：
关于before和after的用法
1.The roof fell __he had time to dash into the room to save his baby.
2.Time passed quickly and three weeks went by _we knew it.
答案都是before,我怎么觉得用after 也一样符合逻辑啊
答
before是在什么之前，after是在什么之后
答
用before
1.在他撞门进去救小孩之前房子就倒了。
2.时间过的飞快，在我们意识到之前就已经过了三个星期了。
如果用after的话第一句就变成：
the roof fell after he dashed into the room and saved the baby.第二句变成after的话，不合逻辑吧
答
肯定是before啊
1、在他冲进房间救他孩子之前,屋顶掉了下来
他还来不及救～
主要是题中用了 have time to do sth.有时间做某事,所以只能有before
如果原句改成The roof fell after he had dashed into the room to save his baby 意思就是他救出他的孩子后屋顶掉下来了
2.时间过得好快啊,我们意识到之前,三个星期就过去了
也就是说三个星期不知不觉就过去了～
如果用after,他们意识到过了三个星期的话,前面就不会感慨时间过得快了～