时间状语从句

更新时间：2020-11-29 05:49:56 55次访问

____  sth beats us, we can first put it down in our notebook. 这个句子中为什么不能填as，而可以填when

其实意义都双同的，只是一个放在前, 而另一个放在后, 举例 :

When she beats us, we can first put it down in our notebook 

= We can first put it down in our notebook as she beats us.