一、关系副词引导的定语从句
1．when引导的定语从句
[观察典例]
I can not forget the day when I first saw you.
The old man still remembers the time when he first travelled by plane.
Please tell us the date when you were born.
[归纳用法]
when 指时间，在从句中作时间状语。先行词通常是time，day，week，year 等。
2．where引导的定语从句
[观察典例]
This is the house where they lived a week ago.
Japan is one of the few countries where people drive on the left.
Is this the place where it happened?
