Complaint and complain look almost the same, so it is easy to mix them up. Many English learners know that both words are connected with problems, dissatisfaction, or something they do not like. The problem starts when they have to put the right word into a sentence.
For example, should you say, “I have a complain” or “I have a complaint”? Is it correct to say, “She complaint about the food”? These small mistakes are very common, especially for beginners.
The good news is that the difference is actually simple. The two words have different jobs in a sentence. Complain is a verb, while complaint is a noun. Once you understand this basic grammar point, choosing the right word becomes much easier.
You will see these words often in daily conversations, emails, customer service, workplaces, schools, hotels, shops, and formal writing. Knowing the difference can help you sound more natural and avoid common grammar mistakes.
By the end of this guide, you will understand what each word means, how to use it, which prepositions usually follow it, and how to tell the difference quickly.
You will also get everyday examples and a short practice section to check what you have learned.
What Does “Complaint” Mean?
Complaint is a noun. It means a statement that says you are unhappy or dissatisfied about something.
In simple words, a complaint is the problem or expression of dissatisfaction that someone makes known.
For example:
- I made a complaint about the service.
- The manager received a complaint from a customer.
- She has a complaint about her room.
Here, complaint is a thing or idea. It is not an action.
Think about this simple pattern:
have + a complaint
You can have a complaint, make a complaint, receive a complaint, or file a complaint.
When Should You Use “Complaint”?
Use complaint when you are talking about the actual statement, problem, or expression of dissatisfaction.
It is especially common after words such as:
- a
- the
- my
- your
- his
- her
- their
- one
- several
- many
For example:
I have a complaint.
The word a comes before complaint because complaint is a singular countable noun.
You can also make it plural:
The company received several complaints.
The plural form is complaints.
Grammar Rule for “Complaint”
The main rule is:
Complaint = noun
A noun can name a person, place, thing, or idea. In this case, complaint names an expression of dissatisfaction.
Common structures include:
have + a complaint
I have a complaint.
make + a complaint
He made a complaint about the food.
file + a complaint
She filed a complaint with the company.
receive + a complaint
The hotel received a complaint from a guest.
complaint + about + something
We received a complaint about the noise.
Examples of “Complaint”
- I have a complaint about this product.
- The customer made a complaint about the service.
- We received a complaint from one of our guests.
- She filed a formal complaint against the company.
- His main complaint was the long waiting time.
- The manager listened carefully to my complaint.
- There were several complaints about the new system.
- Your complaint has been sent to the customer service team.
Notice that complaint is used as a noun in every sentence.
You can put an article before it:
a complaint
You can use a possessive:
my complaint
Or you can make it plural:
complaints
A Common Confusion with “Complaint”
A very common mistake is using complain where a noun is needed.
Incorrect:
I have a complain.
Correct:
I have a complaint.
Why is the first sentence wrong? Because have needs a noun here. Complain is a verb, so it cannot be used in this position.
Another common mistake is:
She made a complain.
Correct:
She made a complaint.
The verb made is followed by the noun complaint.
A useful question to ask yourself is:
“Am I naming the problem or talking about the action?”
If you are naming the problem or statement, use complaint.
What Does “Complain” Mean?
Complain is a verb. It means to say that you are unhappy, dissatisfied, or annoyed about something.
It describes an action.
For example:
I complained about the food.
The word complained tells us what the person did. The person expressed dissatisfaction.
You can use complain in different tenses:
- complain
- complains
- complained
- complaining
When Should You Use “Complain”?
Use complain when you are talking about the action of expressing dissatisfaction.
For example:
I want to complain about the service.
Here, complain is a verb because it describes what the speaker wants to do.
You can also use it in everyday conversation:
Stop complaining.
She always complains about the weather.
He complained to the manager.
Grammar Rule for “Complain”
The basic rule is:
Complain = verb
Because it is a verb, it can change according to tense and subject.
For example:
Present:
I complain about the noise.
Third-person singular:
He complains about the noise.
Past:
He complained about the noise.
Present continuous:
He is complaining about the noise.
You will also often see complain about and complain to.
“Complain About”
Use complain about when you say what the person is unhappy with.
She complained about the food.
They complained about the noise.
He complained about the high price.
The thing causing the dissatisfaction comes after about.
“Complain To”
Use complain to when you say who receives the complaint.
I complained to the manager.
She complained to the teacher.
They complained to the hotel staff.
You can combine both:
I complained to the manager about the service.
This tells us both who you spoke to and what you were unhappy about.
Examples of “Complain”
- I want to complain about the service.
- She complained about the noise last night.
- He often complains about his job.
- We complained to the manager about the food.
- Please do not complain about every little thing.
- The customers are complaining about the delay.
- My brother complained that the room was too cold.
- They complained to the airline about their lost luggage.
Again, notice the difference. Complain is describing an action, so it works as the verb in the sentence.
Difference Between Complaint and Complain
The easiest way to understand the difference is to remember their parts of speech.
| Word | Part of speech | Basic meaning | Example |
|---|---|---|---|
| complaint | Noun | An expression of dissatisfaction | I made a complaint. |
| complain | Verb | To express dissatisfaction | I complained about the service. |
The words are related, but they do not have the same grammatical job.
Complaint Is a Noun
A noun can be used after words such as a, the, my, your, his, her, this, that, several, and many.
For example:
I have a complaint.
This is my complaint.
The manager received several complaints.
You cannot normally replace complaint with complain in these sentences.
Incorrect:
I have a complain.
Correct:
I have a complaint.
Complain Is a Verb
A verb describes an action.
I complain about the noise.
She complained about the noise.
They are complaining about the price.
You cannot normally use complain as the noun in these structures.
Incorrect:
He made a complain.
Correct:
He made a complaint.
Compare the Sentence Structures
Look at these two sentences:
I made a complaint about the food.
I complained about the food.
Both sentences communicate a similar idea, but the grammar is different.
In the first sentence, made is the verb and complaint is the noun.
In the second sentence, complained is the verb.
This is one of the most useful ways to understand the difference.
“Make a Complaint” vs “Complain”
These expressions are closely related.
Make a complaint:
I made a complaint to the manager.
Complain:
I complained to the manager.
Both are grammatically correct.
However, complain is often more direct and natural in everyday conversation.
For example:
I complained about the food.
This sounds simple and natural.
Make a complaint can sound more formal, especially when talking about customer service, official procedures, or written complaints.
I would like to make a formal complaint about this service.
“Complaint About” vs “Complain About”
Both words can be followed by about, but their grammar is different.
With the noun:
We received a complaint about the noise.
With the verb:
The guests complained about the noise.
The meaning is closely related, but the sentence structure changes.
Meaning Comparison
Think of the difference this way:
Complaint = the thing
Complain = the action
For example:
Her complaint was about the price.
The complaint is the statement or issue.
She complained about the price.
Complained is the action she performed.
This simple idea will help you in most situations.
Grammar Rules You Must Remember
Rule #1: Use “Complaint” as a Noun
When you need a noun, use complaint.
I have a complaint about this bill.
Here, complaint is the thing the speaker has.
Do not say:
I have a complain.
The correct form is:
I have a complaint.
Rule #2: Use “Complain” as a Verb
When you need an action, use complain.
Customers often complain about high prices.
Here, complain describes what customers do.
In the past:
Customers complained about high prices.
In the continuous form:
Customers are complaining about high prices.
Rule #3: “Complain About” Means Say You Are Unhappy About Something
Use complain about when you mention the subject of the dissatisfaction.
She complained about the food.
He complained about the noise.
They complained about the delay.
Remember:
complain + about + problem
Rule #4: “Complain To” Tells You Who You Speak To
Use complain to when you mention the person or organization that receives your complaint.
I complained to the manager.
She complained to the teacher.
We complained to the airline.
You can use both prepositions in one sentence:
I complained to the manager about the service.
to = person or organization
about = problem
This is a very useful pattern for everyday English.
Common Mistakes Students Make
Many learners make mistakes with these words because they look and sound similar. The endings are different, but the connection between them can make learners think they can be used in the same way.
They cannot.
Mistake 1: “I Have a Complain”
Incorrect:
I have a complain.
Correct:
I have a complaint.
After a, you need the noun complaint.
Mistake 2: “She Made a Complain”
Incorrect:
She made a complain about the service.
Correct:
She made a complaint about the service.
The expression is make a complaint, not make a complain.
Mistake 3: “He Complaint About the Food”
Incorrect:
He complaint about the food.
Correct:
He complained about the food.
Here, the learner wants a past-tense verb. The correct form is complained.
Remember that complaint is a noun, while complained is the past form of the verb complain.
Mistake 4: Using “Complaint” as a Verb
Incorrect:
She complaint about her boss.
Correct:
She complained about her boss.
Complaint cannot be used as the ordinary verb in this sentence.
Mistake 5: Confusing “Complain” and “Complaint” in Formal Writing
Incorrect:
I am writing to complain regarding a complaint.
This may sound confusing because the two forms are being mixed without a clear purpose.
Better:
I am writing to complain about the poor service.
Or:
I am writing to make a formal complaint about the poor service.
Both can work, depending on the sentence.
An Easy Correction Tip
When you are unsure, look at the word before the blank.
If you see:
a / an / the / my / your / his / her / several / many
you may need a noun.
I have a complaint.
If the blank needs an action, you may need the verb.
I want to complain.
Another useful trick is to ask:
“Can I replace the word with an action?”
If yes, complain is probably the right choice.
Easy Trick to Remember the Difference
Here is a simple classroom trick:
Complaint = thing
Complain = action
Think about going to a restaurant.
You are unhappy because your food is cold.
You can say:
I want to complain about my food.
That is the action.
After speaking to the manager, you might say:
I made a complaint about my food.
That is the complaint itself.
Another easy memory trick is to look at the endings.
Complain ends in -ain and works as a verb:
I complain.
Complaint ends in -aint and works as a noun:
a complaint
You do not need to memorize complicated grammar terms. Just remember:
I complain.
I have a complaint.
That pair alone can help you choose the right word in many situations.
Try making your own pair:
I complain about the noise.
I have a complaint about the noise.
Both are correct.
Daily Life Examples
These words appear in many normal situations. Here are examples that you may hear at work, in shops, while traveling, or during everyday conversations.
Example 1: At a Restaurant
Customer: The food is cold.
Friend: You should complain to the waiter.
Here, complain is the action.
You could also say:
I have a complaint about my food.
Here, complaint is the noun.
Example 2: At a Hotel
The guest complained about the noisy room.
The guest expressed dissatisfaction, so complained is the verb.
Example 3: Customer Service
I want to make a complaint about this product.
This sounds natural in a customer-service situation, especially when the speaker wants to make the issue official.
Example 4: Talking About a Friend
My brother always complains about his job.
Here, complains is the verb because it tells us what your brother often does.
Example 5: Talking to a Manager
I complained to the manager about the delay.
To the manager tells us who received the complaint.
About the delay tells us what the problem was.
Example 6: A Formal Situation
The company received a formal complaint from a customer.
Here, complaint is a noun because it refers to the official expression of dissatisfaction.
Example 7: A Small Everyday Problem
Stop complaining about the weather!
This is a normal spoken-English sentence.
The speaker is telling someone to stop expressing dissatisfaction.
Example 8: At School
The students complained to the teacher about the classroom temperature.
The students complained to the teacher about the problem.
Example 9: At Work
We received several complaints about the new software.
Here, complaints is plural because more than one complaint was received.
Example 10: Talking About Your Own Problem
I have a complaint about my internet service.
Or:
I want to complain about my internet service.
Both are correct, but the grammar is different.
Practice Section
Choose the correct word in each sentence: complain, complains, complained, complaint, or complaints.
1. I have a ______ about the service.
a) complain
b) complaint
2. She often ______ about her long working hours.
a) complaint
b) complains
3. We ______ to the manager yesterday.
a) complained
b) complaint
4. The company received several ______ from customers.
a) complain
b) complaints
5. I want to ______ about this damaged product.
a) complain
b) complaint
Answers
1. complaint
I have a complaint about the service.
The word follows a, so we need the noun.
2. complains
She often complains about her long working hours.
The subject is she, so the present-tense verb is complains.
3. complained
We complained to the manager yesterday.
The word yesterday shows that the action happened in the past.
4. complaints
The company received several complaints from customers.
The word several requires a plural countable noun.
5. complain
I want to complain about this damaged product.
After want to, we use the base form of the verb: complain.
FAQs
What is the difference between complaint and complain?
Complaint is a noun, while complain is a verb. A complaint is an expression of dissatisfaction, while to complain means to express that dissatisfaction. For example, “I made a complaint” and “I complained about the service” are both correct.
Is “I have a complaint” correct?
Yes, “I have a complaint” is completely correct. Complaint is a singular countable noun, so a can come before it. You can also say “I have a complaint about the service.”
Is “I have a complain” correct?
No. “I have a complain” is incorrect in standard English. The correct sentence is “I have a complaint.” The reason is simple: after a, you need the noun complaint, not the verb complain.
Can we use “complain” in a question?
Yes. You can use complain in many types of questions.
For example:
Did you complain to the manager?
Why are you complaining?
What did she complain about?
In each case, complain is used as a verb.
Is “complaint” formal or informal?
Complaint can be used in both everyday and formal English. For example, “I have a complaint about the food” is normal in conversation. “I would like to make a formal complaint” is more formal and is common in business or customer-service situations.
Which is correct: “complain about” or “complaint about”?
Both can be correct, but they have different grammar. Complain about uses the verb: “They complained about the noise.” Complaint about uses the noun: “They made a complaint about the noise.”
Can I say “make a complain”?
No. The correct expression is “make a complaint.” Make is followed by the noun complaint in this structure. You can also use the simpler verb: “complain.”
What is the difference between “complain to” and “complain about”?
Complain to tells us who receives the complaint. Complain about tells us what the problem is.
For example:
I complained to the manager about the food.
The manager is the person, while the food is the problem.
Final Conclusion
The difference between complaint and complain becomes easy once you focus on their grammar.
Complaint is a noun. It refers to the statement, problem, or expression of dissatisfaction. You can have a complaint, make a complaint, receive a complaint, or file a complaint.
Complain is a verb. It describes the action of expressing dissatisfaction. You can complain about something or complain to someone.
When you are speaking or writing, ask yourself one simple question: Am I talking about the thing, or am I talking about the action? If it is the thing, choose complaint. If it is the action, choose complain.
A little practice will make this difference feel natural. Try using both words in your own sentences today.
For example, “I complained about the noise” and “I made a complaint about the noise.” Once you can create pairs like these, you will be much less likely to confuse the two words.
I am Benjamin Clark, an English language writer passionate about simplifying grammar, vocabulary, and word meanings. I create clear, accurate, and practical content to help learners improve their English skills with confidence every day.
