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Definition of “of” - Learner’s Dictionary

of

preposition     strong /ɒv/ weak /əv/
BELONG
A1 belonging or relating to someone or something: a friend of mine the colour of her hair part of the problemBelongings and possessions
AMOUNT
A1 used after words that show an amount: a kilo of apples both of us a handful of raisinsGeneral words for size and amountMeasurements in general
NUMBER
A1 used with numbers, ages, and dates: a boy of six a decrease of 10% the 14th of February 2012General words for size and amount
CONTAIN
A1 containing: a glass of milk sacks of rubbishIncluding and containingComprising and consisting of
MADE
made or consisting of: dresses of lace and silkIncluding and containingComprising and consisting ofComprising and consisting ofIncluding and containing
ADJECTIVE/VERB
SHOW
A2 showing someone or something: a map of the city
CAUSE
B1 showing a reason or cause: He died of a heart attack.Connecting words which introduce a cause or reason
POSITION
A2 showing position or direction: the front of the queue a small town north of Seattle
ACTION/FEELING
used after nouns describing actions or feelings to mean 'done to' or 'experienced by': the destruction of the rain forest the suffering of millions
WRITTEN
B1 written or made by: the collected works of William Shakespeare
(Definition of of from the Cambridge Learners Dictionary © Cambridge University Press)
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by Liz Walter If you are a learner of English and you are confused about the words there, their and they’re, let me reassure you: many, many people with English as their first language share your problem! You only have to take a look at the ‘comments’ sections on the website of, for example, a popular

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a small amount of something that shows you what the rest is or should be like

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