English LearningUpdated 2026-09-227 min read

Adjectives or Adverbs? The Rule That Fixes Most Mistakes

Priya Sharma writes English learning guides for ESL students. Pune-based language enthusiast.

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Say it good or say it well? Learn the one-question test that tells you when to use an adjective and when to use…

Quick answer: Use an adjective when you describe a thing or a person, and an adverb when you describe how an action is done. She is a careful driver, but she drives carefully. The exception is linking verbs like be, seem, look, sound, taste and feel, which take an adjective.↗ Share on X

Ask yourself one question before you choose the word: am I describing a thing or an action? If you are describing a thing or a person, use an adjective (*a fast car*, *she is happy*). If you are describing how an action happens, use an adverb (*he drives fast*, *she smiled happily*). That single question fixes most adjective and adverb mistakes in everyday conversation. The rest of this article shows you the handful of cases where the question needs a little help.

What does the one-question test look like in practice?

Sentence	What is being described	Correct word
She is a ___ driver.	driver (a person)	careful
She drives ___.	drives (an action)	carefully
That was a ___ answer.	answer (a thing)	quick
He answered ___.	answered (an action)	quickly
They are ___ workers.	workers (people)	hard
They work ___.	work (an action)	hard

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Why is "I'm good" fine but "She sings good" wrong?

Because *good* and *well* do different jobs.

Good is an adjective. It describes a thing or a person. *A good film. The food is good. I'm good.*

Well is the adverb. It describes how an action is done. *She sings well. He speaks English well. It went well.*

So:

She sings good. → She sings well.
He cooks really good. → He cooks really well.
My English is good. → correct as it is. *English* is a thing.

There is one exception people love to argue about. *Well* can also be an adjective when it means healthy. *I don't feel well* means I feel sick. *I don't feel good* usually means the same thing in everyday speech, and nobody will correct you for it. Save your energy for *sings well*.

Which five word pairs trip up almost everyone?

Adjective	Adverb	The trap
hard	hard	hardly means "almost not at all" — I hardly slept
late	late	lately means "recently" — I've been tired lately
near	near	nearly means "almost" — I nearly fell
high	high	highly means "very much" — a highly respected teacher
most	most	mostly means "mainly" — the class is mostly beginners

Which verbs take an adjective instead of an adverb?

Here is where the one-question test needs help. A small group of verbs, called linking verbs, do not describe an action at all. They connect the subject to a description. After them you use an adjective, even though a verb is sitting right there.

The main ones: be, seem, look, sound, smell, taste, feel, become, get, stay, appear.

The soup smells delicious. (not *deliciously*)
You look tired. (not *tiredly*)
That sounds strange. (not *strangely*)
She became famous. (not *famously*)
The milk went bad. (not *badly*)

The quick check: replace the verb with *is* or *are*. If the sentence still makes sense, use an adjective. *The soup is delicious* works, so *smells* takes an adjective. *He drives is careful* is nonsense, so *drives* takes an adverb: *he drives carefully*.

Where do you put the word in the sentence?

Position matters more than learners expect, and putting the word in the wrong place sounds stranger to a native ear than picking the wrong word.

Adjectives go in two places only:

1. Directly before the noun: *a red door*, *an expensive phone*.

2. After a linking verb: *the door is red*, *the phone seems expensive*.

Adverbs are more flexible, but there is one hard rule: never put an adverb between a verb and its object.

I speak well English. → I speak English well.
She plays beautifully the piano. → She plays the piano beautifully.
He opened slowly the door. → He opened the door slowly.

Adverbs of frequency (always, usually, often, sometimes, never, rarely) have their own spot: before the main verb, but after *am / is / are / was / were*.

I always drink coffee in the morning.
She never arrives late.
He is always late. (after *is*, not before)

How do you turn an adjective into an adverb?

Four spelling rules cover nearly everything.

1. Most words: add *-ly*. slow → slowly, careful → carefully, quiet → quietly.

2. Ends in consonant + y: change *y* to *i*, add *-ly*. easy → easily, happy → happily, angry → angrily.

3. Ends in -le: drop the *e*, add *-y*. simple → simply, terrible → terribly, gentle → gently.

4. Ends in -ic: add *-ally*. basic → basically, automatic → automatically. (One exception: public → publicly.)

And five irregulars worth memorising, because they appear constantly:

Adjective	Adverb
good	well
fast	fast
hard	hard
early	early
daily	daily

When you use two adjectives, what order do they go in?

English speakers follow an order they were never taught. You can learn it in one line:

Opinion → size → age → shape → colour → origin → material → noun.

a *lovely little old* house (opinion, size, age)
a *big black plastic* bag (size, colour, material)
an *expensive Italian leather* jacket (opinion, origin, material)

Say *a black big bag* and a native speaker will understand you but will hear that something is off. In daily conversation you rarely stack more than two, so the practical version is simpler: opinion first, then everything else in the order above. And never put a comma between adjectives from different categories: *a big black bag*, not *a big, black bag*.

A five-minute drill you can do today

1. Pick five sentences you actually said this week, in your language or in English.

2. For each one, underline the describing word.

3. Ask: is it describing a thing or an action?

4. If it is an action, check that you used the adverb form, and check it is not sitting between the verb and the object.

5. Say the corrected sentence out loud three times. Out loud matters. Your mouth learns faster than your eyes.

Do this for one week and the choice stops being a decision. It becomes a reflex.

Ten quick corrections to check yourself against

Wrong	Right
He speaks very good English.	He speaks English very well.
Drive safe.	Drive safely. (though drive safe is common and accepted in casual US speech)
She sings beautiful.	She sings beautifully.
I'm feeling badly about it.	I'm feeling bad about it.
The cake tastes sweetly.	The cake tastes sweet.
He runs quick.	He runs quickly.
They arrived lately.	They arrived late.
I hardly work every day.	I work hard every day.
She is always late?	Is she always late?
Answer me honest.	Answer me honestly.

Your next step

Do not try to memorise every rule on this page today. Take one thing: the *is* test. For the next three days, every time you want to describe something after a verb, swap that verb for *is* in your head. If the sentence still works, use the adjective. If it does not, add *-ly*.

That one habit will catch most of the mistakes on this page, and you can add the rest later once it feels automatic.

FAQ

Is it correct to say 'drive safe' instead of 'drive safely'?

Strictly, drive safely is the grammatical form because safely describes the action of driving. Drive safe is very common in casual American speech and nobody will misunderstand you, but use drive safely in writing, at work, or in an exam.

Why is 'I feel badly' wrong when I want to say I am sorry?

Feel is a linking verb, so it takes an adjective: I feel bad. I feel badly literally describes your sense of touch working poorly. This is one of the most common over-corrections by learners who assume -ly is always safer.

Do all adverbs end in -ly?

No. Fast, hard, late, early, straight and high keep the same form as adverbs. And some -ly words are adjectives, not adverbs, such as friendly, lovely and lonely. You cannot judge the job of a word by its ending, only by what it is describing.