The first (and maybe most important) difference is grammatical. Quick is an adjective. The comparative and superlative are quicker and quickest. The adverb is quickly and its comparative and superlative are more quickly and most quickly. (Some speaker use the adjective instead of the adverb when they speak.)
On the other hand, fast is both an adjective and an adverb. The comparative and superlative of both are faster and fastest.
E.g. Let’s do a quick test.
E.g. Get you pen quickly and sit down again.
E.g. He is a fast learner.
E.g. He learns fast.
The difference in meaning is not very big. In most situations quick and fast and also quickly and fast have the same meaning. Fast is a shorter word and maybe a little more common because we are lazy about using a longer word if there is a short one.
However, in certain situations, one word may be more common than the other because they form special partnerships with other words. This is called collocation.
E.g. the fast lane – the part of a road such as a motorway designed for cars to move quickly.
You need to learn collocations when you meet them, bit by bit.
Quick identifies doing things in a short period of time while fast indicates speed.
EVERY VS. ALL: (Elementary to Intermediate)
All and every can both be used to talk about people or things in general. There is little difference of meaning. Note that these two words are used in different structures.
Every is used with singular countable nouns. To give the same meaning, all is used with plural nouns.
- All children need love.
- Every child needs love.
With Determiners
All can be used with determiners. Every cannot normally be used with them.- All the lights were out.
- Every light was out. (NOT Every the light…)
- I have invited all (of) my friends.
- I have invited every friend I have. (NOT …every my friend.)
With Uncountable Nouns
We can use all with uncountable nouns. Every cannot be used with them.- I like all music. (NOT …every music.)
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