Adjective vs Adverb Mistakes
A2 · ElementaryCommon Grammar MistakesDrive careful vs. drive carefully, I feel bad vs. I feel badly — small word-ending mistakes that change what a sentence sounds like.
What you'll learn
- Adjectives describe nouns (a careful driver); adverbs describe verbs, adjectives, or other adverbs (drive carefully)
- Most adverbs of manner are formed by adding -ly to an adjective: careful → carefully, quick → quickly
- After a linking verb (be, feel, look, seem, taste, smell, sound), use an adjective, not an adverb, to describe the subject
- 'Well' is the adverb form of 'good' for most verbs (she sings well), but 'good' stays an adjective and doesn't become 'goodly'
- 'Really'/'very' + adjective modifies a noun quality; 'really'/very + adverb modifies an action — don't confuse 'real' (adjective) with 'really' (adverb) as an intensifier
Two jobs, two different word forms
Adjectives and adverbs both describe things, but they describe different parts of a sentence. An adjective describes a noun (a careful driver). An adverb describes how an action happens (drive carefully). Mixing them up is one of the most common mistakes even at a fairly high level.
Don't drop the -ly ending
When you're describing HOW an action happens, you usually need the -ly adverb form, not the plain adjective.
After a linking verb, use an adjective
Linking verbs like be, feel, look, seem, taste, smell, and sound connect the subject to a description of the subject itself — not of an action — so they take an adjective, not an adverb.
Good vs. well
'Good' is an adjective — it describes a noun. 'Well' is usually the adverb that goes with it, describing how something is done. 'Well' can also be an adjective meaning 'healthy'.
Real English
Watch out
The verb 'drive' needs an adverb to describe how it's done, not an adjective.
'Feel' here is a linking verb describing a state, not an action — it takes an adjective.
'Did' is an action here, so it needs the adverb 'well', not the adjective 'good'.
'Really' (adverb) intensifies the adjective 'interesting'; 'real' is itself an adjective and can't modify another adjective this way.
Real life — Giving feedback after a presentation
"How did it go?"
"I think it went really well — the audience seemed genuinely interested."
"That's great! You spoke really clearly, too."
"Thanks — I was a bit nervous, but I tried to stay calm."
Practice
Exercise 1 · Choose the correct sentence
Which is correct?
Exercise 2 · Choose the correct sentence
Which is correct?
Exercise 3 · Choose the correct sentence
Which is correct?
Exercise 4 · Choose the correct sentence
Which is correct?
Exercise 5 · Choose the correct sentence
Which is correct?
Exercise 6 · Choose the correct sentence
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Exercise 7 · Choose the correct sentence
Which is correct?
Exercise 8 · Choose the correct sentence
Which is correct?
Exercise 9 · Correct the mistake
Correct the mistake: He plays the guitar good.
Exercise 10 · Correct the mistake
Correct the mistake: She is a quick learner and learns things quick.
Quick challenge
Five quick questions to check what stuck.
Question 1 / 5
Score: 0/0
Which is correct?
You learned
- Adjectives describe nouns; adverbs describe verbs, adjectives, or other adverbs.
- Most manner adverbs add -ly to the adjective: careful → carefully.
- After a linking verb (be, feel, look, taste, seem), use an adjective, not an adverb.
- 'Good' is the adjective; 'well' is usually its adverb (and can also mean 'healthy').
Related grammar lessons
Common Verb Mistakes
A focused review of the most frequent verb mistakes learners make — extra 'be', missing -s, double tense marking, and misplaced auxiliary verbs.
Subject–Verb Agreement Mistakes
A focused review of the trickiest subject–verb agreement errors — agreeing with the wrong noun when a phrase comes between the subject and the verb, and singular indefinite pronouns that feel plural.
Common Article Mistakes
A focused review of the most persistent article mistakes — missing 'a/an' before a job or role, and an extra 'the' added to general statements or place names that don't need one.
Common Preposition Mistakes
A focused review of the prepositions most often paired with the wrong verb or adjective — married to (not with), depend on (not of), listen to (not nothing at all).