We have two rooms to live in为什么加in?

We have two rooms （ ）（live）in.为什么答案是to live 而不是lived呢?不是have we have two rooms to live in,but we haven't decided which on we have two rooms to live in,but I can't decide________.两个选项 have rooms to live in.这里为什么用in,live什么时候做及物动词,什么时候做不及物动词 We have two rooms ( ),but I can't decide ( ) .Ato live,to ch His family live in a small house () only two rooms we need to book two double rooms for the first week in Novem i have no room to live in 后面为什么要加介词in we had already_____(book)two rooms in a hotel. We are looking forward to living in the palace.为什么look,live加 have no place to live要加in吗 We have to e_____everything in between these two ages.