of [ o·f ]
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Phrase
Grammar
Preposition
1. Expressing the relationship between a part and a whole.
2. With the word denoting the part functioning as the head of the phrase.
the sleeve of his coat
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3. After a number, quantifier, or partitive noun, with the word denoting the whole functioning as the head of the phrase.
nine of the children came to the show
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4. Expressing the relationship between a scale or measure and a value.
an increase of 5%
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5. Expressing an age.
For a baby of only three months, she was remarkably heavy.
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6. Indicating an association between two entities, typically one of belonging, in which the first is the head of the phrase and the second is something associated with it.
a photograph of the bride
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7. Expressing the relationship between an author, artist, or composer and their works collectively.
the paintings of Rembrandt
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8. Expressing the relationship between a direction and a point of reference.
north of Watford
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9. Expressing the relationship between a general category or type and the thing being specified which belongs to such a category.
this type of book
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10. Following a noun derived from or related to a verb.
The thoughts of the people concerned were not taken into account.
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11. Followed by a noun expressing the subject of the verb underlying the first noun.
the decision of the County Council
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12. Followed by a noun expressing the object of the verb underlying the first noun.
payment of his debts
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13. Where the head of the phrase is a predicative adjective.
it was kind of you to ask
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14. Indicating the relationship between a verb and an indirect object.
15. With a verb expressing a mental state.
What do you think of the result of today's meeting?
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16. Expressing a cause.
He died of a heart attack at the age of 58.
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17. Indicating the material or substance constituting something.
the house was built of bricks
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18. Expressing time in relation to the following hour.
I'd love to stay here with you, but it's ten of two.
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Usage
1. It is a mistake to use of instead of have in constructions such as you should have asked (not you should of asked). For more information, see have
Origin
1. Old English, of Germanic origin; related to Dutch af and German ab, from an Indo-European root shared by Latin ab and Greek apo.

