什么时候定语从句前用in
什么时候定语从句前用in which？
which？
当先行词待会原句中做状语的时候，且短语为in加先行词。也可以用where
定语从句中介词后可跟哪些关系代词？
关系代词只能用which（指物）或whom(指人) ，即：介词 which/whom。
通常介词放在定语从句中动词后，也可以放在关系代词前面，但有些特殊动词短语搭配不能拆分，介词只能放在动词后，如： look for, look after, pay attention to ,take care of , look forward to, listen to等。
定语从句介词 which或which的用法？
定语从句中的介词 which 是把从句中的介词提到了关系代词which前。它们构成一种固定搭配关系。如：We will hold a sports meet next week in which everyone is required to behave well.
在该句子中in which就等于where.
which 在定语从句中作主语或宾语。
比如：I like the job which offers me a good chance.
The problem which we are dealing with is very important.
定语从句中，介词 which中的介词有哪些？
常见的英语中的介词有：at, after, by, before, in, to, on, for, through, beside, behind, near, under……, 定语从句中，介词 which中的介词，前面这些常见的介词都可以。例句：
is a house beside the road, the wondows of which are broken.
is a hole in the wall, through which he can see everything outside the house.
is an old farm, on which he worked for three years.