英语关于定语从句关系词where和why、when可以用介词+which代替,可是应该怎么用呢 请大家尽快回复 急

1.when指时间,在定语从句中做时间状语
From the year when he was going to school he began to know what he wanted when he grew up.
本句中when=in which
2.where指地点,在定语从句中做地点状语
This is the house where I lived two years ago.
本句中where=in which
3.why指原因,在定语从句中做原因状语
The reason why he refused the invitation is not clear,
本句中why=for which

where 一般等于 in which/at which/on which
why 一般等于 for which
when 一般等于 on which/at which
记住，只是一般等于，要看具体情况