which用法和in which的用法有什么区别？

Question

如题所述

Answer 1

区别一：
which是关系代词或关系形容词,作为代词用作主语或宾语,作为形容词用作定语；
“介词短语+ which”属于副词性,只能用作状语.如：
This is my house, (which) is small and old.
这是我的房子,它又小又旧.[主语]
He is studying economics, (which subject) is very important.
他正在学习经济学, 该学科是很重要的.[定语]
This is the subject (on which) she spoke.
这就是她谈到的话题. [状语]
区别二：
which 用于定语从句，作关系代词，在句中要做成分

in which 用于定语从句，作关系副词，在句中不做成分，in which=where