Time flies is the correct spelling. Time flys is incorrect in standard English because the verb fly changes to flies when used with a third-person singular subject, such as time.
Use time flies when expressing how quickly time seems to pass.
Correct: Time flies when you’re having fun.
Incorrect: Time flys when you’re having fun.
The rule is simple: When a verb ends in a consonant followed by y, change the y to ies to form the third-person singular present tense.
Quick Answer: Time Flies or Time Flys?
| Expression | Correct or Incorrect | Explanation |
|---|---|---|
| Time flies | Correct | Fly changes to flies because the subject time is singular. |
| Time flys | Incorrect | Flys is not the standard third-person singular spelling of fly. |
Remember: Always write time flies, not time flys, in standard English.
Why Is “Time Flies” Correct?
Time flies is grammatically correct because time is a singular subject and flies is the correct third-person singular form of the verb fly.
In English, most verbs ending in a consonant followed by y change the y to ies when used with he, she, it, or another singular subject.
For example:
- Fly → Flies
- Try → Tries
- Cry → Cries
- Carry → Carries
- Study → Studies
Since time is a singular noun, the correct sentence is:
Time flies when you’re having fun.
Here, flies describes how quickly time seems to pass.
Why Is “Time Flys” Incorrect?
Time flys is incorrect because it does not follow the standard English spelling rule for verbs ending in a consonant followed by y.
When forming the third-person singular present tense, replace the final y with ies.
Incorrect: Time flys so quickly.
Correct: Time flies so quickly.
The same spelling rule applies to other verbs:
- She tryes her best. → She tries her best.
- He studys every day. → He studies every day.
- The baby crys at night. → The baby cries at night.
Therefore, flys should not be used as the standard spelling of the verb in this context.
What Does “Time Flies” Mean?
Time flies is a common English expression meaning that time seems to pass very quickly.
People often use it when they realize that an enjoyable experience, an important event, or a particular period has passed faster than expected.
Examples:
- Time flies when you’re having fun.
- I can’t believe it’s December already. Time flies!
- Time flies when you spend time with good friends.
- It feels like yesterday that we graduated. Time flies.
- Time flies, especially when you’re busy with work.
The expression is often used in everyday conversations to describe how quickly days, months, or years seem to pass.
The Grammar Rule: Why Fly Becomes Flies
The spelling difference between flys and flies follows an important English verb rule.
When a verb ends in a consonant followed by y, change the y to ies to form its third-person singular present tense.
Examples:
| Base Verb | Third-Person Singular |
|---|---|
| Fly | Flies |
| Try | Tries |
| Cry | Cries |
| Study | Studies |
| Apply | Applies |
| Reply | Replies |
| Worry | Worries |
However, when a verb ends in a vowel followed by y, simply add s.
Examples:
| Base Verb | Third-Person Singular |
|---|---|
| Play | Plays |
| Enjoy | Enjoys |
| Stay | Stays |
| Buy | Buys |
| Say | Says |
This is why fly becomes flies, while play becomes plays.
Time Flies in Example Sentences
Here are examples showing how to use time flies naturally in everyday English.
- Time flies when you’re having fun with friends.
- I can’t believe another year has passed. Time flies!
- Time flies when you’re busy working on something you enjoy.
- It seems like only yesterday that we started school. Time flies.
- Time flies when you spend your days doing what you love.
- The children are growing up so quickly. Time flies.
- Time flies, and we should make the most of every moment.
- We have known each other for ten years. Time flies!
- Looking back at my childhood, I realize how quickly time flies.
- Time flies when you’re traveling and exploring new places.
Common Mistakes to Avoid
Writers sometimes use flys because they assume that adding s is enough to form the third-person singular tense.
However, English spelling rules require a different change for verbs ending in a consonant followed by y.
| Incorrect | Correct |
|---|---|
| Time flys quickly. | Time flies quickly. |
| She flys to New York. | She flies to New York. |
| He tryes again. | He tries again. |
| The baby crys loudly. | The baby cries loudly. |
| She studys English. | She studies English. |
Important: The correct spelling is flies when it is the verb form of fly. The word flies can also be a plural noun referring to insects.
Frequently Asked Questions
Is It Time Flies or Time Flys?
Time flies is correct. The subject time is singular, so the verb fly changes to flies in the third-person singular present tense.
Why Does Fly Change to Flies?
The verb fly ends in a consonant followed by y. English spelling rules require changing the final y to ies when forming the third-person singular present tense.
What Does Time Flies Mean?
Time flies means that time seems to pass very quickly. It is commonly used when describing enjoyable experiences or reflecting on how quickly life moves.
Is “Time Flies When You’re Having Fun” Correct?
Yes. Time flies when you’re having fun is a grammatically correct and widely used English expression. It means enjoyable activities can make time seem to pass quickly.
Is Flys Ever Correct?
Flys is not the standard spelling of the verb fly in ordinary English usage. The correct forms include fly, flies, flew, flown, and flying.
What Is the Difference Between Fly and Flies?
Fly is the base form of the verb, while flies is its third-person singular present tense form.
Examples:
- Birds fly across the sky.
- A bird flies across the sky.
What Is the Plural of Fly?
The plural of fly, when referring to the insect, is flies.
Example: Several flies were sitting near the window.
What Is the Past Tense of Fly?
The past tense of fly is flew.
Example: The airplane flew over the mountains.
Final Verdict: Time Flies vs. Time Flys
Time flies is the only correct spelling in standard English. Time flys is incorrect because the verb fly changes its final y to ies when used with the singular subject time.
Remember this simple rule: When a verb ends in a consonant followed by y, change y to ies for the third-person singular present tense.
So, always write time flies, never time flys.
