long since用法例析

除了用作引导词和介词，since还有一种用法：用作副词，在完成时中位于助动词后，为强调还可以再搭配long，形成have (long) since done形式，表示“早就……”。

例：

1. I have since spoken with several of the people who received Christmas letters during their childhood.（2012年高考浙江卷阅读理解D篇）我和其中的几个人说过……
2. I have long since forgotten what we quarrelled about last time we met.我早就忘了我们上次见面吵了些什么。