为什么your、their、our的后面加s呢?

为什么your、their、our的后面加s呢? make up one's mind后面的mind是不是可数名词,若one's是their,your,our加不加s! their,our,your,his,its,my的主格 your our mine their（找不同的一项）谁快谁有分 形容词性物主代词造句（its our your their)用 its our your their 造句不要一样的 求our your(你的) your(你们的) its their的名词性物主代词, 用my,your,our,his,hemy,your,its,their造句 用my,your,our,his,hemy,your,its,their造句 your our mine their找不同类单词这四个单词不同类的单词是什么 MY YOUR HIS HER ITS OUR YOUR THEIR MINE YOURS HIS HERS ITS OUR YOUR THEIRS分别各个单词的意思是什么 They aren't our books. Are they____? A. your B. his C. her D. their 我知道选B,为什么? her hers our ours their theirs your yours us him的用法,可以简单回答,就是在什么前面用什么,但是上面的每个单词都要,比如their用在什么地方,或者是在什么词前面或者是后面,总之那么多的用法都写出 your只能变第一个字母,后面“our”要读同样的读音 C and buy your clothes at our great sale!C的后面填什么？ Our room is big,but theirs bigger than our.这里为什么用的是theirs不是their? about their study and about their work.这里为什么about要出现两次,后面的about可以去掉吗 their theirs our ours its 的用法 用my,your,our,his,hemy,your,its,their造句各3句?