以主格代词、形容词性物主代词、名词性物主代词,作主语各造一个句子

主格代词是指I,you,he,she,it,we,they之类的；
形容词性物主代词是指my,your,his,her,its,our,their之类的,后面需加名词,不能单独使用；
名词性物主代词是指mine,yours,his,hers,ours,theirs之类的,可单独使用.
例如：I have an interesting book.
My sister is taller than hers.
Our classroom is brighter.But theris is darker.

楼上说的才是王道

Ours is a big country.名词性物主代词
形容词性屋主代词不能做主语，可以作主语的定语
My sister is smart.
主格代词：I‘m ok.