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

dawn on sb

If a fact dawns on you, you understand it after a period of not understanding it.

Word of the Day

Highly delighted, bitterly disappointed, ridiculously cheap: adverbs for emphasis.

by Liz Walter,
October 22, 2014
We often make adjectives stronger by putting an adverb in front of them. The most common ones are very and, for a stronger meaning, extremely: He was very pleased. The ship is extremely large. However, we don’t use very or extremely for adjectives that already have a strong meaning, for example fantastic,

Read More 

life tracking noun

October 20, 2014
the use of one or more devices or apps to monitor health, exercise, how time is spent, etc.

Read More