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C) 关系副词when, where, why

用关系副词when时，它的先行词是表示时间的名词，用where时先行词是表示地点的名词，而用why时它的先行词只可能是reason，使用时应注意以下几点：

1） 关系代词的选择主要是看先行词在从句中所作的成分

This is the city where I was born.

This is the city (which/that) he has visited

I don’t know the reason why she is late.

That is the reason (which/that) everybody knows

Do you still remember the day when he arrived?

Do you still remember the day (that/which) we spent together?

2） 关系副词when,where, why可由“介词+which”的结构来替代

Is this the reason for which they came?

He left the day on which I came.

注意：how 不能用来引导定语从句

This is the way how he did it.

D) As 作关系代词的用法

与the same, such连用

This is the same book as I read last week.