例如：He told me some reference books with which I am not very familiar.其中familiar是形容词，那么介词为什么会根据familiar而选择with呢？求解答，谢谢
你所熟悉的那本书，you are familiar with the reference book.先行词是the reference book，在从句中当familiar with的宾语，用which或that,所以是与with 搭配。
这种情况，不是一定是与形容词搭配，而要看具体情况，可以是与动词的搭配、固定用法的搭配等，如：
This is the famous singer about whom we have often talked. 这就是那位我们经常谈论的著名歌唱家。（talk about）
Please tell me the reason for which you were late. 请告诉我你迟到的原因。 (why ＝ for which）(the reason for sth.)
He told me some reference books with which I am not very familiar其实就等价于he told me some reference books which I amnot very familiar with，介词可以提到连接词which前，就如你提供的原句一样，也可以放在跟它搭配的形容词后面，就如同我改了顺序这句一样