“Time has flown by” is correct, while “time has flew by” is incorrect in standard English. The difference comes from the irregular verb fly: its simple past form is flew, while its past participle is flown. Because has is used to form the present perfect and must be followed by a past participle, the correct phrase is “time has flown by.” You can use “time flew by” when using the simple past.
What Is the Difference Between “Time Has Flew By” and “Time Has Flown By”?
The difference is the verb form used after has. Flew is the simple past form of fly, whereas flown is its past participle. The present perfect tense uses has/have + past participle, so “time has flown by” follows the correct grammatical pattern.
“Time has flew by” mixes two different verb forms. Although the meaning is easy to understand, it does not follow standard English grammar.
| Expression | Status | Reason |
|---|---|---|
| Time has flown by. | Correct | Has + flown uses the present perfect correctly. |
| Time has flew by. | Incorrect | Flew is simple past, not the past participle. |
| Time flew by. | Correct | Flew works correctly as the simple past. |
Why It Matters
This distinction matters because English has many irregular verbs whose past and past-participle forms are different. Choosing the wrong form can make otherwise clear writing grammatically incorrect.
The error can appear in everyday conversation, social media, emails, school assignments, professional writing, and personal messages. For example, if you are describing how quickly your university years passed, “Time has flown by” is the standard choice when you are connecting that past period with your present perspective.
Learning this pattern also helps with other irregular verbs. Once you understand why English uses has flown rather than has flew, similar structures such as has gone, has written, and has grown become easier to recognize.
The Core Rule
Use “flown” after has, have, or had. Use “flew” as the simple past form without those helping verbs.
The three main forms of fly are:
- Fly — base form
- Flew — simple past
- Flown — past participle
So:
- ✅ Time flew by.
- ✅ Time has flown by.
- ❌ Time has flew by.
The easiest formula is:
has/have/had + flown
Not:
has/have/had + flew
How to Use “Flew” and “Flown”
When to Use “Flew”
Use flew as the simple past form of fly. It can describe something that happened at a completed time in the past.
For example:
- Time flew by during our vacation.
- The afternoon flew by while we talked.
- The school year flew by.
- The weekend flew by before we realized it.
In each case, flew stands on its own as the main past-tense verb.
When to Use “Flown”
Use flown as the past participle of fly. It normally appears with a helping verb such as has, have, or had.
For example:
- Time has flown by.
- The months have flown by.
- The years have flown by.
- Time had flown by before we noticed.
Here, flown is part of a perfect construction rather than functioning as a simple past verb.
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Why “Has Flew” Does Not Work
Has is a helping verb in the present perfect construction. The main verb must appear in its past participle form. Since flown is the past participle of fly, the correct combination is has flown.
Compare:
| Helping Verb | Correct Form | Incorrect Form |
|---|---|---|
| has | has flown | has flew |
| have | have flown | have flew |
| had | had flown | had flew |
Correct Examples
Conversation
“I can’t believe it. Time has flown by since we first met.”
“The whole afternoon flew by while we were talking.”
“It feels like time has flown by since I joined the company.”
“The last few months have flown by, and the project is nearly complete.”
School
“Time has flown by since my first day of college.”
“The semester flew by because we had so many interesting classes.”
Workplace
“Time has flown by since I started working with this team.”
“The meeting flew by because everyone was actively involved.”
Social Media
“Can’t believe summer is almost over. Time has flown by!”
“Ten years have flown by, and so much has changed.”
Academic Writing
“The researchers noted that several years had flown by before the long-term effects became clear.”
“By the end of the study period, considerable time had flown by since the original observation.”
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Incorrect vs. Correct
| ❌ Incorrect | ✅ Correct | Why |
|---|---|---|
| Time has flew by. | Time has flown by. | Flew is simple past; flown is the required past participle after has. |
| Time has flew by so quickly. | Time has flown by so quickly. | The present perfect requires has + past participle. |
| The years have flew by. | The years have flown by. | Have must be followed by flown. |
| The months have flew by. | The months have flown by. | Flew cannot follow have in this construction. |
| Time had flew by before we noticed. | Time had flown by before we noticed. | Had takes the past participle flown. |
| Time flew by since we started. | Time has flown by since we started. | When the speaker connects the past period with the present, the present perfect is appropriate. |
| Time has flew by yesterday. | Time flew by yesterday. | Yesterday identifies a completed past time, so simple past is normally used. |
| The weekend has flew by. | The weekend has flown by. | The phrase contains has, so the past participle is required. |
| The school year has flew by. | The school year has flown by. | Flown is the past participle of fly. |
| Five years have flew by. | Five years have flown by. | Have flown is the correct perfect construction. |
Why Do People Make This Mistake?
Flew and Flown Both Refer to the Past
One reason for the confusion is that both flew and flown are associated with past events. Learners may remember that flew is a past form of fly and then use it whenever they want to talk about something that happened in the past.
English grammar, however, distinguishes between the simple past and the past participle. That distinction determines whether you use flew or flown.
“Has” Can Mislead Learners
Because has refers to the present form of the verb have, learners may incorrectly assume that the next verb should simply be a past-tense form. English does not work that way in the present perfect.
The structure is has + past participle, so the correct combination is has flown.
Pronunciation Does Not Make the Difference Obvious
In natural speech, the difference between flew and flown can be easy to overlook, especially when the whole phrase is spoken quickly. A learner may therefore reproduce a form that sounds familiar without noticing its grammatical structure.
Other Irregular Verbs Create Similar Problems
English contains many irregular verbs with separate simple-past and past-participle forms. Compare go → went → gone, write → wrote → written, and eat → ate → eaten.
It is therefore important to learn fly → flew → flown as a complete verb pattern rather than memorizing only flew.
Spellcheck Cannot Always Teach the Rule
Grammar and spellcheck tools may identify an error, but correcting a sentence automatically does not necessarily explain why the correction is needed. Understanding the verb pattern is more useful because it allows you to recognize the same error in new sentences.
Common Mistakes Checklist
- Using “has flew”: Replace it with has flown.
- Using “have flew”: Replace it with have flown.
- Using “had flew”: Replace it with had flown.
- Thinking every past event requires “flew”: The correct form depends on the tense and sentence structure.
- Forgetting the three forms: Learn fly → flew → flown together.
- Using “has flown” with a finished-time marker such as “yesterday”: In standard English, use the simple past instead: “Time flew by yesterday.”
Time Has Flew By or Time Has Flown By in Real English
Natural and Standard: “Time Has Flown By”
“Time has flown by” is a standard and natural expression. It is commonly used when someone reflects on how quickly a period of time seems to have passed, especially when the speaker is looking at that period from the present. It works naturally in conversations, messages, emails, personal writing, and professional communication.
Natural and Standard: “Time Flew By”
“Time flew by” is also completely natural. The difference is grammatical rather than one of meaning. It uses the simple past and is particularly suitable when the speaker presents the period as a completed past event. For example, “Time flew by during our vacation” describes the vacation as a finished experience.
Grammatically Incorrect: “Time Has Flew By”
“Time has flew by” is not a standard grammatical alternative. It is understandable, but it combines has with the simple past form flew. In standard English, the past participle flown is required. The natural correction is “Time has flown by.”
American vs. British English
There is no meaningful American-versus-British difference in this rule. Both American and British English use fly → flew → flown, and both use “time has flown by” as the standard present-perfect construction.
Likewise, “time flew by” is standard in both varieties when the simple past is appropriate. “Time has flew by” is not an accepted regional alternative.
Formal vs. Informal Usage
“Time has flown by” and “time flew by” are both suitable for formal and informal contexts. You can use either construction in conversation, emails, school writing, professional communication, and personal messages as long as the tense matches the meaning.
The difference is not about formality. It is about grammar and the time relationship expressed by the sentence.
Comparison Table
| Feature | Time Has Flown By | Time Has Flew By |
|---|---|---|
| Standard English | Yes | No |
| Verb form | Flown | Flew |
| Form of “fly” | Past participle | Simple past |
| Works after “has” | Yes | No |
| Present perfect | Yes | No |
| Meaning intended | Time passed very quickly | Usually intended to mean the same thing |
| Formal writing | Correct | Incorrect |
| Everyday English | Natural | Nonstandard |
Real-Life Situations
Interview
“It has been five years since I started my career, and time has flown by.”
The speaker is reflecting on a period that began in the past and is relevant to the present.
Meeting
“We have been discussing this for an hour. Time has flown by.”
The present-perfect form connects the elapsed period with the current situation.
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“It is hard to believe that three years have flown by since we launched the project.”
Have flown is correct because the subject three years is plural.
Text Message
“Wow, time has flown by! It feels like we just started school.”
This is a natural informal use of the correct expression.
Exam or Academic Writing
“Several years had flown by before the researchers conducted the follow-up assessment.”
Here, had flown is the past perfect construction, because the passing of the years occurred before another past event.
How to Choose the Right Expression
- Look for has, have, or had. If one appears before the verb, use the past participle flown.
- Look for a completed past time. If you are simply describing what happened in the past, flew may be correct.
- Check the time relationship. Present relevance often calls for the present perfect: has flown.
- Check for a finished-time expression. Words such as yesterday normally call for the simple past: flew.
- Remember the pattern. Fly → flew → flown.
The Easiest Way to Remember
Use this simple memory rule:
Flew goes alone. Flown needs a helper.
For example:
- ✅ Time flew by.
- ✅ Time has flown by.
- ✅ Time had flown by.
- ❌ Time has flew by.
Another quick reminder is the complete verb pattern:
FLY → FLEW → FLOWN
If you see has, have, or had, think flown.
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Practice Quiz
Choose the Correct Form
- Time has ______ by since we graduated. (flew / flown)
- The weekend ______ by incredibly quickly. (flew / flown)
- Five years have ______ by since we opened the business. (flew / flown)
- Time ______ by during our vacation last year. (flew / flown)
- The months had ______ by before we realized how much had changed. (flew / flown)
- Time has ______ by so quickly this year. (flew / flown)
- The afternoon ______ by while we were discussing the project. (flew / flown)
- Which is correct: “Time has flew by” or “Time has flown by”?
Answers
- flown
- flew
- flown
- flew
- flown
- flown
- flew
- Time has flown by.
Frequently Asked Questions
Is “time has flew by” correct?
No. “Time has flew by” is not correct in standard English. The correct expression is “time has flown by” because flown is the past participle of fly.
Why do we say “time has flown by”?
Because the sentence uses the present perfect structure has + past participle. The past participle of fly is flown, so the correct combination is has flown.
Can I say “time flew by”?
Yes. “Time flew by” is completely correct. It uses the simple past form flew and is appropriate when describing a completed past period or event.
What is the past participle of “fly”?
The past participle of fly is flown. The complete pattern is fly → flew → flown.
Is “time has flown by” present perfect?
Yes. Has flown is the present perfect form of fly. It presents the passing of time from a past starting point with relevance to the present.
Can “flown” be used without has?
It normally requires a suitable auxiliary verb when functioning as the past participle. For example, has flown, have flown, and had flown are correct constructions. Flown does not normally replace flew as the simple past form.
Is “time flew by yesterday” correct?
Yes. “Time flew by yesterday” is correct because flew is the simple past and yesterday refers to a completed past time.
Is “time has flown by yesterday” correct?
It is not the normal standard construction. Yesterday refers to a finished past time, so simple past is normally used: “Time flew by yesterday.”
Is “time has flown by” formal or informal?
It works in both formal and informal English. You can use it in conversation, text messages, emails, professional writing, and academic contexts when the present-perfect meaning is appropriate.
Is “time has flew by” used by native speakers?
You may encounter the form in informal speech or writing, but its occurrence does not make it a standard grammatical form. For standard English, especially in careful writing, use “time has flown by.”
What is the difference between “time flew by” and “time has flown by”?
“Time flew by” uses the simple past and describes a past event or period. “Time has flown by” uses the present perfect and connects the passing of time with the present. Both are correct when used in the appropriate context.
Quick Summary
“Time has flown by” is the correct standard expression, while “time has flew by” is incorrect. The reason is the irregular verb fly, whose three main forms are fly, flew, flown. Flew is the simple past form, so you can say “Time flew by during our vacation.” Flown is the past participle, so it follows helping verbs such as has, have, and had: “Time has flown by.” The easiest rule is: flew goes alone, while flown works with a helping verb. There is no meaningful American-British difference in this rule. Both forms are appropriate in formal and informal English when their tense is correct.
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