用作定语的句子叫做定语从句.通常置于它所修饰的名词或代词之后,这种名词或代词叫先行词.引导定语从句的关联词为关系代词或关系副词.关系代词在句子中作主语,宾语,定语.关系副词在句子中只能作状语.
The student who answered the question was John.( who answered the question 是关系代词who 引导的定语从句,用以修饰who的先行词student.who在从句中做主语)
The room which served for studio was bare and dusty.这个用作工作室的房间空荡荡的,布满灰尘.
A child whose parents are dead is called an orphan.失去父母的孩子叫做孤儿.
I know the reason why he was so angry.我知道他这么生气的原因.