downstair和downstairs的区别?

题目

downstair和downstairs的区别?
请不要复制词典的内容!最好给出一些例子来,

答案

downstair 只是形容词,这时和downstairs 用法相同.
downstairs 可以做adj之外,还可以做副词和名词.
eg : He is in a downstair(s) room.
Let's go downstairs, shall we?
当做副词用做定语时,放在修饰词之后.
eg : The man downstairs can't stand the man upstairs.