Remember that adverbs modify verbs, adjectives, and other adverbs. Adjectives modify nouns.
Incorrect: I did good on that competition today.
Incorrect: I did bad on that test.
Incorrect: My computer can download files fast!
Incorrect: My computer works perfect.
Correct usage with adverbs:
Correct: I did well on that competition today.
Correct: I did badly on that test.
Correct: My computer can download files quickly!
Correct: My computer works perfectly.