介词前置定语从句，介词可以不提前吗

楼上的搞错了吧...

一般来说如果介词属于一个有特别意义的固定词组的话就不提前，像
this is the book which he is looking for. looking for 固定搭配为寻找的意思 look 跟for的搭配有了一个特定的意思 所以 不提前for

而像楼上举得
this is the room which I once lived in/this is the room in which I once lived. live in 没有什么特别的意思是住在.... 这里的live没有跟in一起 形成一个词组 有新的意思 所以一般要提前

比如The time of year in which you were born decides your star sigh.
先行词为the time of year, 生于...词组为be born in...,因此在which 前需要加介词in. 又如this is the room which I once lived in/this is the room in which I once lived. 介词提前或不提前都可以.

如果是
固定的动词词组
则词组中的介词不能提前
要是不是固定的词组
则介词可以提前！
1、第一句中用的引导词是which
在英语定语从句中
就有
介词+which
这样一种语法
可是没有
介词+that
这一用法的
要想把介词提前
只能用which的
2、this
is
the
question
which
weve
had
so
much
discussion
about.
正常时这样的句子
但是在英语中只要不是固定不可拆的动词词组中的介词
都是默认拿到前面去的！
3、please
wait
for
me!
wait
这是一个祈使句
其中wait
for
是谓语
me
是宾语
please
是祈使句的语气词
！
希望可以帮到你喔！

当然可以！
举个例子吧
This is the house in which i lived 3 years ago.
This is the house which i lived in 3 years ago.
This is the house where i lived 3 years ago.