I want to buy a house to live in 为什么后面要加in

I want to buy a house to live in 为什么后面要加in i want to buy a house to live in 还是live 英语句子分析 i want to find a new house to live in 后面 i have no room to live in 后面为什么要加介词in I want to find a room to live (in),后面那个in介词啊要加的? the poor man needs a house to live in live 后为什么要加in? 在线等,快点, I have a house to live in与I have a house to live那句话对,为什么? this is the house __ I want to buy A.in which B.that C.whose This is the house _______ I want to buy.　　A. in which 　　　B. My mother thinks the house is good to live in 为什么后面要用in they couldn't find a house to live in.为什么还要加in The house has a big garden.I want to live in it.合并成一句