全国大众英语测验语法——干系副词指导的定语从句
干系副词可替代的先行词是时候、地点或来由的名词，在从句中作状语。
1）when, where, why
干系副词when, where, why的含义相称于"介词+ which"构造，因此常常和"介词+ which"构造交替利用，例如：
There are occasions when (on which) one must yield.任何人都有不得不平从的时候。
Beijing is the place where (in which) I was born.北京是我的出生地。
Is this the reason why (for which) he refused our offer?这便是他拒尽我们匡助他的来由吗？
2）that替代干系副词
that可以用于默示时候、地点、体例、来由的名词昆裔替when, where, why和"介词+ which"指导的定语从句，在白话中that常被省略，例如：
His father died the year (that / when / in which) he was born.他父亲在他出生那年去世了。
He is unlikely to find the place (that / where / in which) he lived forty years ago.他不年夜年夜概找到他四十年前栖身过的中央。

关键字：英语语法定语从句 定语从句语法 定语从句语法知识 定语从句的语法 定语从句的语法知识