in which相当于什么引导什么从句

in which引导定语从句，根据句义，可以等于when表示当...时候也可以等于where表示地点I'll never forget these days in which I stayed with you.= I'll never forget these days when I stayed with you.我永远不会忘记我和你待在一起的日子。

This is the city in which I stayed last year.This is the city where I stayed last year.这就是那个去年我待的地方。例句：The English play in which my students actedat the New Year’s party was a great success.“在英语剧中”应用介词in，因此在修饰先行词play的限定性定语从句中也应用介词in与指代先行词play的关系代词which连用，本句中which充当置于定语从句中最前面的介词in的宾语(in which在整个定语从句中充当状语)

In which相当于where引导的定语从句。比如我喜欢我出生的那个家乡。

I like the hometown in which I was born.就相当于I like the hometown where I was born。再比如他就是在这一个母亲教书的学校里毕业的。

He graduated from the school in which his mother teaches.相当于he graduated from the school where his mother teaches。