Who among us doesn’t answer “good” when someone asks “How are you?” even though our moms told us a million times the correct answer is “well”?
“If it works good,” David Neeleman, JetBlue’s founder and chairman, said, “we’ll roll it out to our whole fleet.”
He would have more correctly said, “If it works well.” The American Heritage Dictionary of the English Language opines, “Good is properly used as an adjective with linking verbs such as be, seem, or appear: The future looks good. The soup tastes good. It should not be used as an adverb with other verbs: The car runs well (not good). Thus, The dress fits well and looks good.”
Similarly, the Columbia Guide to Standard American English offers, “When used with the verb do, good is a noun and a direct object (We want to do good with our money), and well is an adverb (She did well on the exam).”
If you’re still not sure about the difference, try taking this quiz. You’ll be speaking good in no time.