英语物主代词有人称和数的变化,同时又分为名词性物主代词(mine, yours, his, hers, its, ours, theirs)和形容词性物主代词(my, your, his, her, its, our, their)。形容词性物主代词,相当于形容词,作定语用,修饰名词;名词性物主代词,相当于名词,作名词的用法,如果不怕重复,可以与形容词性物主代词物主代词进行这样的转换:名词性物主代词=形容词性物主代词+名词。如: This book is mine. = This book is my book. = This is my book.