关于定语从句的问题

那种介词+关系代词形式的

是不是有的是 带介词的短语，介词提前到关系副词前面 还有那种for which等于why的代换。就这两种吗？

　介词+关系代词引导的定语从句关系代词在定语从句中做介词宾语时
　　从句常由介词+关系代词引导
　　(1) The school (that/which) he once studied in is very famous.
　　= The school in which he once studied is very famous.
　　(2) Tomorrow I will bring here a magazine (that/which) you asked for.
　　= Tomorrow I will bring here a magazine for which you asked.
　　(3) We’ll go to hear the famous singer (whom/that/who) we have often talked about.
　　= We’ll go to hear the famous singer about whom we have often talked.
　　注意：1. 含有介词的动词短语一般不拆开使用，如：look for, look after, take care of等
　　T This is the watch which/that I am looking for. (T＝正确)
　　F This is the watch for which I am looking. (F＝错误)
　　2. 若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose
　　(1) The man with whom you talked is my friend. (T)
　　The man with that you talked is my friend. (F)
　　(2) The plane in which we flew to Canada is very comfortable. (T)
　　The plane in that we flew in to Canada is very comfortable. (F)
　　3. “介词+关系代词”前可有some, any, none, both, all, neither, most, each, few等代词或者数词
　　(1) He loved his parents deeply, both of whom are very kind to him.
　　(2) In the basket there are quite many apples, some of which have gone bad.
　　(3) There are forty students in our class in all, most of whom are from big cities.
　　关系代词
　　关系代词（一般情况下）that 可用who ,whom 和which在从句做主语，谓动词的宾语，但是不能做介词的宾语。
　　which指物，在从句中作主语，谓语或宾语；
　　who在从句中作主语；
　　whom在从句中宾语；
　　where在从句中修饰表地点的名词，做地点状语；
　　when在从句中通常修饰表时间的名词，做时间状语；
　　why在从句中做原因状语，先行词通常是"reason"
　　有时why也可用for+which代替。
　　例：A doctor is a person who looks after people's health.
　　______ _ _____ _____________________
　　主语 谓语 先行词 从句
　　|________________________|
　　定语从句修饰先行词 [编辑本段]（五）关系副词引导的定语从句　　1. when指时间，在定语从句中做时间状语
　　(1) I still remember the day when I first came to the school.
　　(2) The time when we got together finally came.
　　2. where指地点，在定语从句中做地点状语
　　(1) Shanghai is the city where I was born.
　　(2) The house where I lived ten years ago has been pulled down.
　　3. why指原因，在定语从句中做原因状语
　　(1) Please tell me the reason why you missed the plane.
　　(2) I don’t know the reason why he looks unhappy today.
　　注意：关系副词引导的从句可以由“介词+关系代词”引导的从句替换
　　(1) The reason why/ for which he refused the invitation is not clear,
　　(2) From the year when/in which he was going to school he began to know what he wanted when he grew up.
　　(3) Great changes have taken place in the city in which./where I was born.