合并成定语从句 What is the address of the factory?we not

What is the address of the factory?we noticed the advertisement of the factory the other day。工厂的地址是什么？几天前我们看到的那个广告中的工厂。

合并成定语从句：What is the address of the factory whose advertisement we noticed the other day。

句子的先行词是 the factory，whose做定语，引导的定语从句。

定语从句由关系代词who、whom、whose、which、what、as和关系副词where、when、why等引导，但须记住:

1.what不能引导定语从句.

2.关系词的分析须考虑它在定语从句中的成分。

选择关系代词时要注意：（1）先找关系词，看先行词指的是什么。 （2）看关系词在从句中所充当的成分。

例如：

This is the house in which we lived last year. 这是我们上年住的那个房子。

(= This is the house which /that we lived in last year.)

I live in the room whose windows face south.我住的房子窗户朝南。

(= I live in the room ,the windows of which face south.)