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物主代词是表示所属关系的代词。物主代词分为形容词性物主代词和名词性物主代词。
（一）形容词性物主代词
形容词性物主代词相当于形容词，不能单独使用，后面一定要跟名词，作定语。
I➡my I love my mother.
you➡your You love your mother.
he➡his He loves his daughter.
she➡her She loves her father.
we➡our We love our school.
they➡their They love their parents.
（二）名词性物主代词
相当于“形容词性物主代词+名词”，以避免重复。
It's my book . It's mine .
They are our books . They are ours .
It's his book . It's his .
It's her book . It's hers .
They are your books . They are yours.
They are their books. They are theirs.
Tips：
1. a friend of mine/his/yours 我的/他的/你的一个朋友
2. Whose book is this？It's his/mine.这是谁的书？是他的/我的。
Exercises
3.3 Complete the sentences （请用“mine，his，hers，yours，ours”等完成句子）
1. This is my bag.This bag is ____.
2. This is her guitar.This guitar is ____.
3. It's our classroom.It's ____.
4. It's his hat.It's ____.
5. It's their car.It's ____.
6. They are your books.They are ____.
7. They are their cups.They are ____.
8. They are our flowers.They are ____.
3.4 Choose the right words （选择合适的词填空）
1. This is a nice hat.Is it ____？（your，yours）
2. I like playing football.It's ____ （my，mine）favorite sport.
3. Whose pencil box is this？Is it ____ （your，yours）？
4. Is this ____ （your，yours）umbrella？
No，it's ____ （his，her）.____ （my，mine）is red.
5. Whose cake is this？It's ____.（my，mine）
6. Whose gloves are these？They are ____.（her，hers）
7. Tom is a friend of ____.（my，mine）
8. We ride our bicycles and they ride ____.（their，theirs）
9. Jill has a brother and a sister.____ （Her，Hers）brother is seven and ____ （her，hers）sister is five.
10. This is a beautiful plant.____ leaves are colorful.（It，Its）