as soon as在一从句中，从句的主句从句的时态关系

在这里Jenny told him she wanted to go home是主句，而As soon as he had finished是一个状语从句。

下面是as soon as的用法用作参考：
它的意思相当于“A事情发生以后，就做B这件事”。
这个短语用的比较常用，口语和书面语都可以。它的特点是，在句子中的位置比较灵活，而且可以用于各种时态。例如：
I’ll write you as soon as I get there.
我一到那儿就给你来信。（一般现在时）
As soon as I went in, Katherine cried out with pleasure.
我一进门，Katherine 就高兴的叫起来。（一般过去时）
I’ll return the book as soon as I have read it.
我一读完就把书还回去。（现在完成时）
Andrew left as soon as he had drunk his coffee.
Andrew一喝完咖啡就走了。（过去完成时）

as soon as 用法有点像虚拟语气，时态是要发生变化的。一般的，主句用一般现在时，从句用过去时。主句过去时，从句用过去完成时。as soon as 引导的部分是从句，这句话中主句是jeny told him ……。