Of

Ofis a preposition.

Ofcommonly introducesprepositional 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 capitalofPeru.

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

Would you like some more piecesoftoast?

We also commonly useofas 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 proudofher.

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

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

Mostofthe new workers in the country are from Turkey.

Someofmy best friends are computer scientists.

Ofis optional withall, both,halfexcept before the object pronounsme, you, it, him, her, us, them:

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

Allofthem will be able to travel on the bus.

Not:All them will be able to…