of

preposition

1》 expressing the relationship between a part and a whole.

2》 expressing the relationship between a scale or measure and a value.

    ↘expressing an age.

3》 indicating an association between two entities, typically one of belonging.

4》 expressing the relationship between a direction and a point of reference.

5》 expressing the relationship between a general category and something which belongs to such a category.

6》 expressing the relationship between an abstract concept and a noun denoting the subject or object of the underlying verb.

7》 indicating the relationship between a verb and an indirect object.

8》 indicating the material constituting something.

9》 N. Amer. expressing time in relation to the following hour.

Phrases

be of possess intrinsically or give rise to: this work is of great value.

Origin

OE, of Gmc origin.

Usage

It is a mistake to use of instead of have in constructions such as you should have asked. For more information, see usage at have.