Good vs Well: When to Use Each | Rules & Examples

Quick answer: good is usually an adjective, while well is usually an adverb. Use good to describe a person, thing, or state, and use well to describe how an action happens. However, well can also be an adjective when it means healthy, and good is common after linking verbs such as feel, look, smell, and taste.

Good vs Well: The Basic Difference

The easiest starting point is grammatical function. Good normally describes a noun or pronoun. Well normally describes a verb and tells us how an action is performed.

Word	Typical role	Example
Good	Adjective	She is a good writer.
Well	Adverb	She writes well.
Well	Adjective for health	I am well today.

Compare these sentences: “He is a good speaker” describes the speaker. “He speaks well” describes the way he speaks. This simple distinction solves many good-versus-well questions.

When to Use Good

Use good when you need an adjective to describe a person, object, idea, experience, result, or quality.

That is a good idea.
She is a good teacher.
We had a good meal.
This book has a good ending.
He is good at math.

Good can also follow linking verbs because linking verbs connect the subject with a description. For example, “The soup smells good” describes the soup, not the manner in which someone smells.

When to Use Well

Use well when it modifies an action or tells how something is done.

She sings well.
He drives well.
The students worked well together.
The computer performed well during the test.
You explained the idea well.

A useful test is to ask “How?” If the answer describes how an action happens, well is often the natural choice.

Why “I Feel Good” Can Be Correct

This is one of the most confusing parts of the topic. Many learners are taught that “I feel well” is correct and “I feel good” is wrong. That is too simple.

Feel can work as a linking verb. In “I feel good,” good describes the speaker’s state. The sentence can refer to mood, general well-being, or how someone feels. In “I feel well,” well can mean physically healthy.

Sentence	Common meaning
I feel good.	I feel positive or generally okay.
I feel well.	I am physically healthy or not sick.
I am doing well.	I am doing successfully or am generally okay.

In everyday American English, “I feel good” is common and accepted. In a formal or health-focused context, “I feel well” can make the intended meaning clearer.

Good and Well After Linking Verbs

Other linking verbs can create the same issue. Consider look, smell, taste, and sound.

The cake tastes good.
You look good in that jacket.
The flowers smell good.
The plan sounds good.

Here, the adjective describes the subject. But if the verb describes an actual action, an adverb may be needed: “The dog can smell well” means the dog has a strong ability to use its sense of smell.

Good vs Well for Health

Well has a special adjective use related to health. This is why “I don’t feel well” is a standard way to say that you are physically sick or unwell.

“I don’t feel good” can also be natural, but it may be broader. Depending on context, it can describe physical discomfort, mood, or an emotional reaction.

For precise health-related writing, well is often the clearer choice: “After resting, she felt well again.”

Good at vs Well

Do not confuse good at with well. Use good at to describe someone’s skill or ability.

Maria is good at chess.
Maria plays chess well.

The first sentence describes Maria’s skill. The second describes how she performs the activity.

Common Mistakes With Good and Well

Common mistake	Better choice	Reason
He runs good.	He runs well.	Well modifies the action runs.
She is a well student.	She is a good student.	Good describes the noun student.
He did good on the test.	He did well on the test.	Well describes how he performed.
The soup tastes well.	The soup tastes good.	Good describes the soup through a linking verb.

Some informal uses of good as an adverb occur in everyday speech. For careful formal writing, however, well is usually the safer choice when describing how an action is performed.

A Simple Test for Choosing Good or Well

Find the word being described.
If it is a noun or the subject after a linking verb, try good.
If you are describing how an action happens, try well.
If well means physically healthy, it can act as an adjective.

For example, “The student gave a good answer” describes the answer. “The student answered well” describes the action.

Good vs Well Examples in Everyday English

That was a good movie.
The actors performed well.
You made a good choice.
You explained your choice well.
The new plan looks good.
The team worked well together.
I don’t feel well today.
I feel good about the decision.

Practice: Choose Good or Well

Try these before checking the answers:

She writes very ___.
That is a ___ explanation.
The new system works ___.
The pizza tastes ___.
He is ___ at tennis.
I don’t feel ___ today.

Answers: 1. well 2. good 3. well 4. good 5. good 6. well. Remember that context can affect sentences involving linking verbs.

How Good and Well Work in Real Writing

Good and well can appear close together in the same sentence, but they can still perform different jobs. For example, “She is a good writer who writes well” uses good to describe the person’s quality as a writer and well to describe the writing action. Seeing the two words side by side makes the grammatical difference easier to remember.

Another useful comparison is “He gave a good presentation” versus “He presented the material well.” The first sentence evaluates the presentation. The second focuses on the quality of the action.

Good or Well in Questions

Questions can make the choice seem harder because everyday conversation often uses both forms naturally.

Did you sleep well?
Was the movie good?
Do you feel well today?
Do you feel good about the decision?

When the question asks about an action, well often fits. When it asks about a person, thing, quality, or state, good may fit. Always check the meaning instead of relying on a memorized rule alone.

Frequently Asked Questions

Is “I feel good” grammatically correct?

Yes. In everyday American English, “I feel good” is an accepted construction. It commonly describes a positive or satisfactory state.

Is “I feel well” also correct?

Yes. “I feel well” is especially useful when you mean that you are physically healthy.

Should I say “I did good” or “I did well”?

For standard formal writing, “I did well” is the usual choice because well describes the performance.

Is good an adverb?

Good is primarily an adjective. Informal speech does use good adverbially in some contexts, but well is the standard choice for describing how an action is performed.

Related Grammar Guides

For more word-choice help, read our guides to English usage rules, grammar basics, your vs you’re, each vs every, and bring vs take.

Trusted Grammar References

For additional reference, see Merriam-Webster on good, Merriam-Webster on well, Cambridge Dictionary on good, Cambridge Dictionary on well, and GrammarBook’s good vs well guide.

Conclusion

The basic rule is simple: good is usually an adjective, while well is usually an adverb. Use good to describe a person, thing, or state, and well to describe how an action is performed. Remember the important health and linking-verb exceptions, and choose the word that matches your intended meaning.