Time flies or Time flys: Which Is Correct?
Updated · Which One Is Correct editorial team
Quick answer: When discussing how quickly the hours pass, the correct phrase is time flies. The version with an s at the end, time flys, is a frequent misspelling that does not exist in standard English. This guide clarifies the difference between the proper verb form and the incorrect pluralization often seen in casual writing. Understanding this distinction ensures your sentences remain grammatically sound and professional in any context.
The Short Answer
Time flies is the correct spelling, whereas time flys is a misspelling that should be avoided in all writing. People often confuse these two forms because the word flies sounds like the plural of fly, leading to the incorrect addition of an s when no plural noun is present. Remember that flies is the third-person singular verb here, describing how the abstract concept of time moves quickly.
The confusion stems from the fact that flies is also a real word for insects, which are plural. However, in the phrase time flies, the word functions as a verb, not a noun. Since the subject is time, which is singular, the verb must take the singular form ending in s, matching the structure of he runs or she jumps.
Side-by-Side Comparison
| Form | Status | Use it when |
|---|---|---|
| Time flies | Correct | Describing the fast passage of time |
| Time flys | Incorrect | Never use this in standard English |
| Flies | Correct | When referring to multiple insects |
| Flys | Incorrect | Never use this as a verb or noun |
Correct Example Sentences
- Time flies when you are having fun with friends.
- As time flies, we have grown up so much.
- It feels like time flies during a vacation.
- Time flies faster than we can believe.
- Do you feel like time flies every day?
- Time flies, yet we remember the old days.
- You will see that time flies quickly.
- Time flies, making youth seem very short.
- I wish time flies more slowly sometimes.
- As time flies, opportunities disappear.
Common Mistakes and Fixes
- Time flys is gone too fast.
- Time flies is gone too fast.
- She said time flys quickly.
- She said time flies quickly.
- Time flys never stands still.
- Time flies never stands still.
- They noticed time flys was moving.
- They noticed time flies was moving.
- Time flys away without us.
- Time flies away without us.
- I know time flys is real.
- I know time flies is real.
A Quick Test You Can Use
To verify if you are using the correct form, check the word flies in your sentence to see if it acts as a verb or a noun. If the sentence describes time moving or passing, then flies is functioning as a verb and must remain in its singular form without an extra s. If you were trying to make the word time plural, you would be incorrect because time is an abstract concept that does not have a plural form.
Related Word Pairs
- Whose vs Who's
- Use whose for possession and who's as a contraction for who is.
- To vs Too vs Two
- To indicates direction, too means also, and two represents the number.
- Affect vs Effect
- Affect is usually a verb and effect is usually a noun.
- Compliment vs Complement
- Compliment refers to praise while complement refers to something completing another.
- Its vs It's
- Its shows possession while it's is a contraction for it is.
Frequently Asked Questions
Why do people write time flys instead of time flies?
Many people mistake time flys because they associate the s ending with plural nouns like birds or dogs. They forget that flies is a verb form here, describing the action of moving, which requires a singular s to match the singular subject time.
Is time flys ever acceptable in any context?
Time flys is never acceptable in standard English or formal writing. Even in casual conversation, using the incorrect spelling makes you appear less educated and suggests a lack of familiarity with basic grammar rules regarding verb conjugation.
What is the difference between the verb flies and the noun flies?
The verb flies describes the action of something moving through the air, while the noun flies refers to a group of insects. In the phrase time flies, the word is clearly a verb because it describes how the concept of time moves past us.
Are there other phrases that follow this same rule?
Yes, many common expressions use singular verbs that sound like plural nouns, such as man knows or she knows. In these cases, the word ending in s is a verb conjugation, not a plural marker, so adding an extra s creates an error.
