as

Listen:
 'AS': [ˌeɪˈɛs]; 'as': strong: [ˈæz], weak: [əz]


Inflections of 'as' (nnoun: Refers to person, place, thing, quality, etc.): nplplural noun: Noun always used in plural form--for example, "jeans," "scissors.": asses
WordReference Collins English Usage © 2019
as
used in time clauses
If something happens as something else happens, it happens while the other thing is happening.
She cried as she told her story.
The play started as I got there.
You also use as to say that something is done whenever something happens.
Parts are replaced as they grow old.
Be careful
Don't use ‘as’ simply to mean ‘at the time that’. For example, don't say ‘As I started work here, the pay was £20 an hour’. You say ‘When I started work here, the pay was £20 an hour’.
➜ See when
meaning ‘because’
As is often used to mean ‘because’ or ‘since’.
She bought herself an iron as she felt she couldn't keep borrowing Anne's.
As he had been up since 4 a.m. he was now very tired.
➜ See because
used with adjectives
You can use as in front of an adjective to say how someone or something is regarded or described.
They regarded manual work as degrading.
His teachers described him as brilliant.
Be careful
Don't use ‘as’ after comparative adjectives. Don't say, for example, ‘The trees are taller as the church’. You say ‘The trees are taller than the church’.
She was much older than me.
used in prepositional phrases
You can also use as in prepositional phrases to say how someone or something is regarded, described, treated, or used.
Pluto was originally classified as a planet.
I treated business as a game.
I wanted to use him as an agent.
You can also use as in prepositional phrases to say what role or function someone or something has.
He worked as a clerk.
Bleach acts as an antiseptic.
used in comparisons
In writing, as is sometimes used to compare one action to another.
He looked over his shoulder as Jack had done.
She pushed him, as she had pushed her son.
Like and the way are used in a similar way.
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Be careful
You don't usually use ‘as’ in front of a noun phrase when you are comparing one thing or person to another. Don't say, for example, ‘She sang as a bird’. You say ‘She sang like a bird’.
He swam like a fish.
I am a worker like him.
Be careful
However, you can make a comparison using as, an adjective or adverb, and another as. For example, you can say ‘You’re just as bad as your sister'.
➜ For more information, see as ... as
'as' also found in these entries:
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