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Fast, quick or quickly?

from English Grammar Today

Fast and quick mean moving with great speed. Fast is both an adjective and an adverb. Quick is an adjective and the adverb form is quickly.

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It was a fast train.

We need to have a quick chat before the meeting.

Fast and quick are adjectives.

You walk very fast!

Not: … very fastly.

We should do it as quickly as possible.

Fast and quickly are adverbs.

We usually use quick to refer to something happening in a short time, or a shorter than expected time:

We stopped for a quick snack.

Not: … a fast snack.

I just need a quick answer.

Not: … a fast answer.

Fast refers to things that happen or go at high speed, e.g. a train, a person running:

She loves fast cars.

Not: She loves quick cars.

Note the common expression fast food to refer to food such as hamburgers, which are cooked and served in a very short time in restaurants:

You shouldn’t eat so much fast food. It’s not good for you.

(“Fast, quick or quickly ?” from English Grammar Today © Cambridge University Press. Need grammar practice? Try English Grammar Today with Workbook.)
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