find a house to live in,find a place to live为什么前者要加介词in ,而后者不加?还有许多类似的,请告诉我一下此处介词in的用法

they couldn't find a house to live in.为什么还要加in the poor pld man has nowhere ______.let's find a house for him_____A,to live;living B,to live in;to live in C,to live;to live in 8.He needs __find______ (find) a new house for the dog to live in.该怎么写 find a house to live in,find a place to live为什么前者要加介词in ,而后者不加?还有许多类似的,请告诉我一下此处介词in的用法 They really need a house _____.A live B to live C to live in Do you find it comfortabla to live in this house?的意思 Do you find it c( ) to live in this house?括号里填什么? Do you find it c( ) to live in this house?括号里填什么?急! My friend has a house by the sea ( ) A.live B.to live C.live in D.to live inTHANKS! He wants to find a better room to live找错 英语句子分析 i want to find a new house to live in 后面英语句子分析i want to find a new house to live in 后面的in哪来的?为什么加?类似的句子又如何分析? i live in a house next to o___ (首字母填空) 改错：“The poor man needs a house to live.” They are looking for a house是不是to live in I have a house to live in与I have a house to live那句话对,为什么?I have a house to live in与I have a house to live哪句话对,为什么？ live in a house close to the shop. they tried to find themselves a larger house为什么themselves they are happy (　　　　　）in a new house.(live,living,to living,to live