Of - English Grammar Today - Cambridge Dictionaries Online
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Of is a preposition.

Of commonly introduces prepositional phrases which are complements of nouns, creating the pattern: noun + of + noun. This pattern is very common, especially to indicate different parts, pieces, amounts and groups:

Lima is the capital of Peru.

Twenty-four-hour TV news makes sure we all know the main events of the day.

Would you like some more pieces of toast?

We also commonly use of as a preposition after different adjectives (afraid of, generous of, proud of) and verbs (approve of, dream of, think of):

I never thought she could take a flight on her own at her age. I feel very proud of her.

Best of luck with the interview tomorrow. We’ll be thinking of you.

We use the structure determiner + of + noun in expressions of quantity:

Most of the new workers in the country are from Turkey.

Some of my best friends are computer scientists.

Of is optional with all, both, half except before the object pronouns me, you, it, him, her, us, them:

Both (of) the finance ministers have decided to resign.

All of them will be able to travel on the bus.

Not: All them will be able to

(“Of” from English Grammar Today © Cambridge University Press. Need grammar practice? Try English Grammar Today with Workbook.)
Add Cambridge dictionaries to your browser to your website
Word of the Day
straight

the straight part of a racetrack (= the track on which competitors race)

Word of the Day

Are you a glass-half-full person? (Everyday Idioms)
Are you a glass-half-full person? (Everyday Idioms)
by Kate Woodford,
July 29, 2015
A reader of this blog recently asked for a post on idioms that are used in everyday English. This seemed like a reasonable request. After all, if you are going to make the effort to learn a set of English idioms, you want those idioms to be useful. The question, then, was

Read More 

exoskeleton noun
exoskeleton noun
July 27, 2015
a robotic device which goes around the legs and part of the body of a person who cannot walk and allows them to move independently and in an upright position The device, known as an exoskeleton, is strapped to the outside of a person’s limbs and can then be controlled by them.

Read More