Many learners get confused between “flys” and “flies.” They look almost the same, and both seem related to the word fly. But only one of them is correct in most situations.
This confusion usually happens because English spelling rules can change when words become plural or verbs change form. The good news is that once you understand a simple rule, you will never mix them up again.
Quick Answer
- “Flies” is the correct and common form
- Plural of fly (the insect) → One fly, two flies
- Verb form of fly → He flies a plane
- “Flys” is almost never correct
- It is not standard English
- You should avoid using it
👉 In simple words: Use “flies,” not “flys.”
Simple Origin or Background
To understand this better, let’s look at how English words change.
In English, when a word ends with a “y”, we often change it when making it plural or adding verb endings.
- If a word ends in consonant + y (like fly), we:
- Remove y
- Add ies
Example:
- fly → flies
- baby → babies
- city → cities
This is a common spelling rule in English, and it helps explain why “flies” is correct.
Clear Explanation of the Difference
1. What is “Flies”?
“Flies” has two main uses:
A. Plural noun (more than one insect)
- One fly → Two flies
- Example: There are many flies in the room.
B. Verb form (present simple)
- Used with he, she, it
- Example: She flies to London every year.
👉 So, “flies” is both a plural noun and a verb form.
2. What is “Flys”?
“Flys” is not correct in modern English.
- It is considered a spelling mistake
- You will not see it in correct writing
- Native speakers do not use it
👉 If you write “flys,” it should almost always be corrected to “flies.”
Comparison Table
| Feature | Flies ✅ | Flys ❌ |
| Correct spelling | Yes | No |
| Plural of “fly” | Yes (two flies) | No |
| Verb form | Yes (he flies) | No |
| Used in writing | Common | Not used |
| Recommended | Always use | Avoid completely |
Which One to Use and When
Use “Flies” in these situations:
1. When talking about insects
- The flies are everywhere.
- I killed two flies.
2. When using the verb with he/she/it
- He flies a kite.
- She flies to Dubai every month.
- The bird flies high.
Do NOT use “Flys”
❌ Incorrect: He flys a plane.
✅ Correct: He flies a plane.
❌ Incorrect: There are many flys here.
✅ Correct: There are many flies here.
👉 Simple rule: If you think of writing “flys,” change it to “flies.”
Common Mistakes People Make
Here are some common errors and how to fix them:
Mistake 1: Adding “s” instead of “ies”
❌ Two flys are on the wall.
✅ Two flies are on the wall.
Mistake 2: Wrong verb spelling
❌ She flys to work every day.
✅ She flies to work every day.
Mistake 3: Forgetting the “y → ies” rule
Many learners forget that y changes to ies after a consonant.
Mistake 4: Thinking both are correct
Some people believe “flys” is an alternative spelling.
👉 It is not. Only “flies” is correct.
Everyday Real-Life Examples
Let’s see how “flies” is used in daily life:
In Emails
- Our CEO flies to New York next week.
- Please close the window, flies are coming in.
In Social Media
- This bird flies so beautifully!
- Too many flies in my room today 😩
In News or Reports
- The pilot flies international routes.
- Flies are spreading disease in some areas.
In Daily Conversation
- Look, the kite flies so high!
- There are flies near the food.
Short Learning Section for Students and Beginners
Here is an easy way to remember:
Step-by-step rule
- Look at the word: fly
- Ask: Is it plural or verb with he/she/it?
- Change y → ies
- Write: flies
Easy Memory Trick
👉 “If a word ends in Y, don’t just add S — change it to IES.”
Practice Sentences
Fill in the blank:
- The bird ___ high.
- There are many ___ in the kitchen.
- She ___ to Paris every year.
Answers:
- flies
- flies
- flies
FAQ Section
1. Is “flys” ever correct?
No, “flys” is not correct in standard English. Always use “flies.”
2. What is the plural of “fly”?
The plural of “fly” is “flies.”
3. Why does “fly” become “flies”?
Because of the rule:
- consonant + y → change to ies
4. Is “flies” a verb or a noun?
It can be both:
- Noun: Many flies
- Verb: He flies a plane
5. How do I remember the correct spelling?
Remember this simple idea:
👉 Y changes to IES, not S.
6. Do native speakers use “flys”?
No, native speakers use “flies.”
7. What are similar words like “fly”?
Here are some similar examples:
- cry → cries
- try → tries
- baby → babies
8. Is this rule always true?
It is true for most words ending in consonant + y.
Conclusion
The difference between “flys” and “flies” is actually very simple once you know the rule.
- “Flies” is the correct form
- It is used for both plural nouns and verb forms
- “Flys” is not correct and should be avoided
If you remember one thing, remember this:
👉 Change “y” to “ies” — not just add “s”
With a little practice, you will use “flies” correctly every time without thinking twice.
