English plurals can get tricky, and this is a perfect example.
You might see passerby, passerbyers, or passersby and wonder which one is actually correct. Since the word structure is unusual, many people make mistakes without even realizing it.
Let’s break it down in a simple and fun way so you never get confused again!
Quick Answer
- ❌ Passerbyers = Incorrect
- ⚠️ Passerby = Singular
- ✅ Passersby = Correct plural
👉 One person = passerby
👉 Many people = passersby
What Does “Passerby” Mean?
A passerby is a person who is walking past a place or passing by casually.
Examples of “Passerby”
- A passerby helped the lost child.
- The shop attracted a curious passerby.
👉 It refers to one person.
What Is the Correct Plural?
The correct plural is passersby ✅
This may look strange, but it follows a special rule.
Examples of “Passersby”
- Several passersby stopped to watch.
- The accident caught the attention of many passersby.
👉 It refers to more than one person.
Why “Passersby” Is Correct
The word passerby is made of two parts:
- passer (person)
- by (preposition)
👉 The plural is formed by changing the main noun (“passer”), not the whole word.
So:
- passer → passers
- passerby → passersby
Why “Passerbyers” Is Wrong
Incorrect:
- passerby + ers ❌
This breaks the grammar rule and sounds unnatural.
Quick Comparison Table
| Word | Meaning | Correct Usage |
|---|---|---|
| Passerby | One person passing | ✅ Correct (singular) |
| Passersby | Many people passing | ✅ Correct (plural) |
| Passerbyers | Incorrect form | ❌ Wrong |
Common Mistakes to Avoid
Incorrect:
- Many passerbyers were watching. ❌
- Several passerby stopped. ❌
Correct:
- Many passersby were watching. ✅
- A passerby stopped. ✅
Easy Memory Trick
Think of this:
👉 The “person” changes, not “by”
So:
Passer → Passers → Passersby
Similar Words (Same Rule)
These follow the same pattern:
- Mother-in-law → Mothers-in-law
- Attorney general → Attorneys general
👉 Only the main noun changes!
American vs British English
There is no difference:
- Passerby (singular)
- Passersby (plural)
Both are correct in all forms of English.
Frequently Asked Questions (FAQs)
What is the correct plural of passerby?
The correct plural is passersby.
Is passerbyers a real word?
No. It is incorrect in standard English.
Can passerby be plural?
No. It is only singular.
Why is it passersby and not passerbys?
Because the main noun “passer” is pluralized, not “by.”
Is passersby formal or informal?
It is used in both formal and informal English.
Are there similar words like this?
Yes, like “mothers-in-law” and “attorneys general.”
Final Thoughts
The difference between passerby, passersby, and passerbyers comes down to understanding how compound nouns form plurals. Passerby is the singular form, while passersby is the correct plural. The form passerbyers is incorrect and should be avoided.
A simple way to remember is that only the main noun changes. Once you get used to this pattern, words like this will feel much easier to use correctly.
Mastering small grammar rules like this can make your English sound more natural and polished—so keep practicing and enjoy learning!
