定语从句介词加which时怎么用
which 引导定语从句，当定语从句中的which是做介词的宾语，就要在which前加介词。
例如：This is the city in which I lived.（这就是我居住的城市。）在这个从句中，which就是做介词in 的宾语，所以前面一定有in。
介词＋which 的定语从句用法：
1、表示地点，时间和原因的“介词＋which”分别相当于 where，when，why。
例句：
The earth on which ／where we live is a planet.
我们居住的地球是一个行星。
2、of ＋which”起形容词的作用，相当于whose（用来指物），其词序通常是“n. ＋of which”。
例句：
They live in a house whose door ／the door of which opens to the south.
他们住在一个门朝南的房子里。
扩展资料
which的用法：
先行词是物,在定语从句中作主主语或宾语。
主要特点：
①which在定语从句中作主语时不能省略，作宾语时可以省略，引导非限制性定语从句时不能省略；
②which的前面可以有介词；
③which的先行词可以是前面数个的的句子,意为”这使…….;这一点……”。
A computeris a machine which can do many things for us.
电脑是一种可以为我们做许多事情的机器。( which作主语)
The chair on which she sat is made of wood
她坐的椅子是用木头做的。( which作介词的宾语)
Mo yan was awarded the nobelprize in literature , which made us happy
介词+Which来换：
whose = of which(指物)
when = on which
why = for which
where = in which
