Which sentence is grammatically incorrect in professional communication?

Which sentence is grammatically incorrect in professional communication?

• A. How may I help you?
• B. May I shampoo you now?
• C. This oil works well on a normal skin type.
• D. This oil works good on a normal skin type.

Answer: (D)

In professional communication, describe how something does something with an adverb, not an adjective. The verb here is “works,” so the modifier should tell how it works. “Well” does that correctly, giving the sense that the oil functions effectively. “Good” is an adjective that would modify a noun, not the verb, which makes that sentence sound awkward and incorrect in this context. The version with “well” is clear and natural for professional settings. The other sentences sit well in tone and structure: they use polite or direct requests and a proper adverb to describe how the oil operates. If you wanted to tweak the phrasing further, you might say “for normal skin types,” but the key grammar point is using “well” rather than “good.”

In professional communication, describe how something does something with an adverb, not an adjective. The verb here is “works,” so the modifier should tell how it works. “Well” does that correctly, giving the sense that the oil functions effectively. “Good” is an adjective that would modify a noun, not the verb, which makes that sentence sound awkward and incorrect in this context. The version with “well” is clear and natural for professional settings. The other sentences sit well in tone and structure: they use polite or direct requests and a proper adverb to describe how the oil operates. If you wanted to tweak the phrasing further, you might say “for normal skin types,” but the key grammar point is using “well” rather than “good.”