Many people get confused when writing the plural of passerby. Words like passerbyers, passerbys, and passersby look similar, but only one is grammatically correct. This confusion is common because the plural form does not follow the usual English pattern.
In this guide, you will learn the correct plural of passerby, the grammar rule behind it, common mistakes to avoid, and simple examples. By the end, you will know exactly when to use passerby and passersby with confidence.
Why “Passerby” Causes So Much Confusion?
The word passerby confuses many English learners because it does not follow the normal plural rule. Most nouns become plural by adding s at the end, but passerby is different. This leads many people to write passerbys or passerbyers, even though both are incorrect.
The confusion also happens because by appears at the end of the word. Many people assume the last part should receive the plural ending. In reality, the main noun is passer, so it changes to passers, making the correct plural passersby.
Examples
- Incorrect: Several passerbys watched the parade.
- Correct: Several passersby watched the parade.
- Incorrect: The passerbyers stopped to help.
- Correct: The passersby stopped to help.
What “Passerby” Actually Means?
A passerby is a person who is walking or passing through a place without staying there. The word is commonly used to describe someone who happens to be nearby and may witness an event or notice something happening.
You will often see passerby in news articles, police reports, books, and everyday conversations.
Examples
- A passerby found the missing wallet.
- The injured cyclist received help from a passerby.
- One passerby called the emergency services.
- Every passerby looked at the street performance.
Where the Word “Passerby” Comes From?
The word passerby comes from two parts.
- Passer means a person who passes.
- By means past or nearby.
Together, they describe someone who passes by a place without stopping for long.
The word has been used in English for many years and remains common in newspapers, legal writing, and everyday speech. Because it is a compound noun, it follows a special plural rule that differs from most English nouns.
How to Pluralize “Passerby” Correctly?
The correct plural of passerby is passersby.
Since passer is the main noun, it receives the plural ending. The word by stays the same.
Correct Forms
| Number | Correct Form |
|---|---|
| One person | Passerby |
| More than one person | Passersby |
Incorrect Forms
- Passerbys
- Passerbyers
Example Sentences
- One passerby offered to help.
- Several passersby gathered around the accident.
- Curious passersby stopped to watch the performance.
- Police interviewed nearby passersby after the incident.
Easy Trick to Remember
Think of the sentence like this:
One passer by the road equals one passerby.
Many passers by the road equals many passersby.
Only passer changes to passers, while by always stays the same. This simple rule will help you use the correct plural every time.
What’s the Correct Plural? Passersby, Passerbys, or Passerbyers?
The correct plural is passersby.
English has a small group of compound nouns that form their plural by changing the main noun instead of adding s to the end of the whole word.
Correct:
- One passerby
- Two passersby
- Many passersby
Incorrect:
- Passerbys
- Passerbyers
The Grammar Rule Behind the Confusion
The word passerby is a compound noun made up of two words.
- Passer is the main noun.
- By is an adverb that describes movement.
Since passer is the main noun, it becomes plural.
Passer becomes passers.
This creates the correct plural form:
Passersby
The same grammar rule is used in several other compound nouns.
| Singular | Plural |
| Mother in law | Mothers in law |
| Attorney general | Attorneys general |
| Runner up | Runners up |
| Passerby | Passersby |
Common Mistakes Why People Write Passerbys or Passerbyers
Many learners naturally add s or ers to the end because that is how most English nouns become plural. However, passerby is an exception.
Mistake 1: Writing Passerbys
Incorrect:
- Several passerbys were waiting outside.
Correct:
- Several passersby were waiting outside.
Mistake 2: Writing Passerbyers
Incorrect:
- The passerbyers gathered near the building.
Correct:
- The passersby gathered near the building.
Mistake 3: Using Passersby as Singular
Incorrect:
- A passersby asked for directions.
Correct:
- A passerby asked for directions.
Why This Happens
People often focus on the last part of the word instead of the main noun. Since by comes last, many writers mistakenly add the plural ending there.
How to Use Passersby Correctly in Sentences
Here are simple examples showing the correct usage.
Talking About People on the Street
- Several passersby watched the performance.
- Curious passersby stopped to take photos.
- The loud noise attracted many passersby.
In News Reports
- Police questioned nearby passersby.
- Passersby reported the fire immediately.
- Witnesses included local passersby.
In Everyday Conversation
- The street musician entertained passersby.
- Friendly passersby gave us directions.
- Some passersby smiled as they walked past.
Quick Reference Guide
| Word | Correct or Incorrect | Usage |
| Passerby | ✅ Correct | Singular form |
| Passersby | ✅ Correct | Plural form |
| Passerbys | ❌ Incorrect | Never use |
| Passerbyers | ❌ Incorrect | Never use |
Easy Rule to Remember
If you mean one person, use passerby.
If you mean more than one person, use passersby.
Frequently Asked Questions
What is the correct plural of passerby?
The correct plural is passersby.
Is passerbys a real word?
No. Passerbys is grammatically incorrect.
Is passerbyers correct?
No. Passerbyers is not an accepted English word.
Why is the plural passersby instead of passerbys?
Because passer is the main noun in the compound word, only that part becomes plural.
Is passerby singular or plural?
Passerby is singular. Passersby is the plural form.
Conclusion
The correct forms are easy to remember once you know the grammar rule. Use passerby when talking about one person and passersby when referring to more than one person.
Avoid using passerbys and passerbyers because they are not correct English. Learning this small exception will help you write more naturally and confidently.
Eliana is an English language writer with 10 years of experience. She creates simple grammar guides, vocabulary tips, and writing resources for GrammerMint readers.