1. 表示"属于关系",意为"(属于)......的"。如:the leaves of the tree
2. 表示"(关于)......的"。如:stories of Lei Feng, a map of China
3. 表示"同位关系"。如:He lives in the city of Beijing.
4. 表示某人的品性。如:It's very kind of you to help me.
5. 表示"因为、由于"。如:die of cancer(死于癌症)
6. 用于一些固定短语中。如:Shirts and blouses are made of cotton. I have a lot of homework today.
7. 表示整体与部分的关系。如:three or four of your classmates,the end of the film
但是说“门的钥匙”要用to,是特指门钥匙the key to the door
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