as 一般都以为当...的时候,所以做题时看看,如果as是这个意思的话,后面就加进行式,这个题可以译为我正上车的时候,不小心摔了一跤.
如果表示和...一样讲,主句用了过去式,as后面也加过去式,He did the same thing as his father did.就是说他做了和他爸爸一样的事情.
as 有时也表示原因,像 As he has to meet with his friends,he cannot eat with his family,
所以as 后面什么时候跟过去式还要具体看题,但是当as表示过去一个时候正在发生的事,都加过去进行时,有个窍门,一个句子中,一般是发生在前面的那个动作加进行时.