It is your book the book is yours
it is mine it is my book
it is hers it is her book
it is our book it is ours
一种后边可带名词 一种后边不能带
yours其实是指代名词,意为"你的XX东西"
your是作定语,用来修饰其后的名词,意为"你的"
其它的情况跟这两个一样
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