room 是名词,要用物主代词（my his her their our 等修饰）
some 一些,一般修饰可数名词复数,如：books.,或者不可数名词
请在客户端右上角评价点“满意”即可__Is the baseball on the dofa？__（NO，it isn't）.It's under the sofe .为什么要用NO，it isn't？__Is the baseball on the dofa？__（NO，it isn't）.It's under the sofe .为什么要用NO，it isn't？前面是on, 后面说是under, 所以要用NO，it isn't？