We also use adverb before adjectives and other advervb.
For example : reasonably cheep (adverb+adjective)
Terribly sorry (adverb+adjective)
Incredibly quickly (adverb+adverb)
Good is an adjective.the adverb is well.
Your English is good.
You speak English well.
These words are both adjective and adverb:
Dara is a very fast runner.
Kate is a hard worker.
I was late.