在英语定语从句中,定语从句的结构是:主句(先行词)+关系代/副词+从句
“先行词+介词+引导词(关系代词或关系副词)”引导定语从句的情况:
1.This is the teacher from whom we have learned a lot.
2.Great changes have taken place in that city in which we live.
This is the book I am looking for.
二.引导定语从句的关系副词(when/where/why)可以用“先行词+介词+引导词”代替。
如: