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Examples: He ran fast / quickly / swiftly. (adverbs) That was fast / quick. (adjectives) Sometimes, it's just the smoothness of the sentence or phrase that determines which word you use. We use "quickly" in pre-verb constructions (he quickly walked from the building), and after the verb (he walked quickly from the building) if the sentence rambles on. Shorter sentences tend to use "fast" (he ran fast) and imperatives use "quick" (rather than quickly) in spoken language: Come quick! vs Come quickly!

Quickly is an adverb and fast in an adjective. This means that you use the word "quickly" when you are describing the way a verb, adjective, or adverb works. Like "He paints quickly." An adjective is put before a noun. So the sentence would be "He is a fast painter." (Sorry, I clicked the wrong button the first time so this is on here twice)

Quickly is an adverb and fast in an adjective. This means that you use the word "quickly" when you are describing the way a verb, adjective, or adverb works. Like "He paints quickly." An adjective is put before a noun. So the sentence would be "He is a fast painter."