He runs very quickly.
He runs very quickly.
&
Hе runs vеry fast.

What is the difference?

Question

He runs very quickly.
He runs very quickly.
&
Hе runs vеry fast.

What is the difference?

Answer

'Fast' in this example is an adverb as well .
Quickly and fast are both adverbs here.
The are almost synonyms .
Both describe his running ( describing the verb 'to run' in this example , therefore adverbs) as being speedy, rapid and swift .

Answer

Fast is an adjective while quickly is an adverb.. also fast refers to speed while quickly refers to time.. for example: 
That car is very fast
The car quickly pulled over  :)

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