The house they put us in was ugly. 他们安顿我们住下的那栋房子很丑陋。

    这个句子中的 put 和 in 不是固定搭配：put 的意思是“安置，安顿”； in 的意思是“在......里面”。其中的 they put us in 是一个定语从句，The house 是这个定语从句所修饰的先行词。即： The house they put us in was ugly. =  The house that  they put us in was ugly. = The house which they put us in was ugly. = The house in which they put us was ugly. (注意不能说：The house in that they put us was ugly. 因为介词不能直接放在关系代词 that 的前面)