物主代词包括形容词性物主代词和名词性物主代词。形容词性物主代词只能作定语，包括：my, your, his, her, its, our, their.名词性物主代词相当于形容词性物主代词加名词，可以做主语、表语和宾语，包括：mine, yours, his, hers, its, ours, theirs.
【例句】
Our problems are different from those of other big cities.A friend of mine called on me yesterday and we had a long chat about our school days.
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