Have you ever wondered whether “time has flew by” or “time has flown by” is the correct expression? This is a common grammar question because both flew and flown are forms of the verb fly, but they are not interchangeable. The correct phrase is “time has flown by.”
The confusion usually comes from treating flew and flown as if they were simply different versions of the same past-tense form. They are not. Flew is the simple past tense, while flown is the past participle. Because the phrase contains “has,” it requires a past participle, making “time has flown by” grammatically correct.
This guide explains the difference between flew and flown, shows exactly when each form belongs, and provides practical examples, comparison tables, memory tricks, and a quiz. By the end, choosing between “time has flew by” and “time has flown by” should feel automatic.
The Core Rule Explained Simply
The simplest rule is this:
Use “flew” as the simple past tense. Use “flown” after helping verbs such as “has,” “have,” or “had.”
The verb fly has three important forms:
- Fly, present tense
- Flew, simple past tense
- Flown, past participle
Consider these examples:
- I fly to London every summer.
- I flew to London last summer.
- I have flown to London several times.
Notice the pattern. Flew can stand alone as the main past-tense verb. Flown normally works with a helping verb.
That is why “Time has flown by” is correct. The word has is a helping verb, so the verb following it should be the past participle flown, not the simple past flew.
Category 1: “Flew” as the Simple Past
Use flew when talking about something that happened in the past without using has, have, or had before it.
Examples:
- The bird flew over the house.
- She flew to Paris yesterday.
- The plane flew through the clouds.
- Time flew by during our vacation.
The key point is that flew already carries the past-tense meaning.
Category 2: “Flown” as the Past Participle
Use flown with helping verbs in perfect constructions.
Examples:
- Time has flown by.
- The bird has flown away.
- She has flown to several countries.
- We had flown for six hours before landing.
Here, flown does not work by itself in the same way that flew does. The helping verb provides the grammatical structure that makes the past participle appropriate.
Side-by-Side Comparison Table
| Situation | Example | Meaning | Correct Usage |
| Present tense | Time flies by. | Time passes quickly now or generally. | Flies |
| Simple past | Time flew by. | Time passed quickly in the past. | Flew |
| Present perfect | Time has flown by. | Time has passed quickly up to now. | Flown |
| Past perfect | Time had flown by. | Time had passed quickly before another past event. | Flown |
| Incorrect perfect construction | Time has flew by. | Intended meaning is clear, but grammar is incorrect. | Avoid |
| Infinitive | Time seems to fly by. | Time appears to pass quickly. | Fly |
| Modal construction | Time can fly by. | Time may pass quickly. | Fly |
The easiest distinction is flew versus flown.
Flew belongs to simple past sentences. Flown belongs to perfect constructions that use a helping verb such as has, have, or had.
Deep Dive into “Flew”
When Should You Use “Flew”?
Use flew when an action happened in the past and you are describing it directly.
For example:
“Time flew by during the summer.”
This sentence describes a completed period in the past. There is no helping verb before flew, so the simple past form is correct.
Other examples include:
- The plane flew across the Atlantic.
- The children flew kites in the park.
- A bird flew into the garden.
- We flew home after the conference.
- The weeks flew by while I was traveling.
In each example, flew acts as the simple past form of fly.
Here’s the important distinction.
“Time flew by” is correct.
“Time has flew by” is not correct in standard English.
The addition of has changes the grammatical structure. Once has appears, you need flown.
“Time Flew By” in Context
The expression “time flew by” usually refers to a completed period or a specific past situation.
For example:
Time flew by during our holiday.
This suggests that the holiday is being viewed as a past event.
You could also say:
The afternoon flew by while we were talking.
The afternoon has already passed, so flew naturally describes that completed period.
Quick Test for “Flew”
Use this three-step test:
- Is the sentence describing a completed past event?
- Is there no “has,” “have,” or “had” before the verb?
- Could the sentence work with a specific past-time expression such as yesterday, last year, or during the vacation?
If the answer is yes, flew may be the correct form.
For example:
Last Saturday, time flew by.
That works because last Saturday identifies a completed past period.
Another example:
During my first year at college, time flew by.
Again, flew works because the sentence describes a past period.
The Meaning Shift or Nuance
The difference between “time flew by” and “time has flown by” is not just grammatical. There can also be a difference in perspective.
“Time flew by” places the listener’s attention on a completed past period.
Example:
Time flew by during our vacation.
The vacation is presented as a completed experience.
“Time has flown by” connects the past with the present.
Example:
Time has flown by since we moved here.
The speaker is looking back from the present and commenting on how quickly time has passed.
That distinction is important.
Compare:
The summer flew by.
This focuses on a past summer.
The summer has flown by.
This is more naturally said while the summer is still happening or when its recent passage remains connected to the present.
The grammatical choice can therefore influence the speaker’s time perspective, not merely the verb form.
Why the Confusion Persists
The confusion between flew and flown is understandable because English contains many irregular verbs with different past-tense patterns.
For regular verbs, learners often get a simpler pattern:
- Walk → walked → walked
- Talk → talked → talked
- Play → played → played
The past tense and past participle look identical.
But fly is irregular:
- Fly → flew → flown
This means learners have to memorize two different past forms.
The problem becomes even more confusing because “flew” sounds natural in many contexts.
For example:
“Time flew by.”
That sentence is completely correct.
So when someone later encounters:
“Time has ___ by,”
it can feel natural to insert flew again.
However, grammar requires flown after has.
Another reason for the confusion is everyday speech. People sometimes use incorrect verb forms in casual conversation, and repeated exposure can make those forms sound acceptable.
Still, standard written English follows the established distinction.
Has flown is correct.
Has flew is incorrect.
Formal vs Casual Contexts
In formal writing, academic work, professional communication, and edited content, the distinction between flew and flown should be maintained carefully.
For example:
Correct:
“Several years have flown by since the original study was published.”
Incorrect:
“Several years have flew by since the original study was published.”
The second sentence may be understandable, but it does not meet standard grammatical expectations.
In casual conversation, speakers sometimes make mistakes with irregular verbs. A listener will usually understand “time has flew by,” but that does not make the expression grammatically standard.
For professional writing, the safest choice is simple:
Use “time has flown by.”
For a completed past event, use:
“Time flew by.”
This rule works across emails, essays, websites, reports, academic assignments, and business communication.
Case Studies and Pop Culture Examples
The expression “time flies” is deeply established in everyday English. It appears in conversations about childhood, relationships, careers, travel, education, and major life events.
Consider a person looking through old photographs:
“I cannot believe how much time has flown by.”
The speaker is connecting the past with the present, so has flown is appropriate.
Now imagine someone describing a finished vacation:
“Time flew by during our trip.”
The speaker is describing a completed past experience, so flew is appropriate.
The same distinction appears in educational contexts.
A student might say:
“The semester flew by.”
If the semester is being viewed as a completed period, this is natural.
A professor might say near the end of the current semester:
“This semester has flown by.”
The present perfect construction emphasizes the connection between the elapsed time and the current moment.
The pattern is consistent across contexts.
Past event: flew.
Past-to-present connection: has flown.
Advanced Scenarios and Flowchart
When the choice feels confusing, use this decision process.
Start with the sentence.
Does the sentence contain “has,” “have,” or “had” before the verb?
↓
YES → Use “flown.”
↓
Example: Time has flown by.
NO → Continue.
↓
Is the sentence describing a completed past event?
↓
YES → Use “flew.”
↓
Example: Time flew by during our vacation.
NO → Continue.
↓
Is the sentence in the present tense?
↓
YES → Use “fly” or “flies,” depending on the subject.
↓
Example: Time flies by when you’re having fun.
Is the sentence expressing a future or modal idea?
↓
YES → Usually use “fly.”
↓
Example: The next few weeks will fly by.
This flowchart works because it focuses on grammar structure first, rather than trying to memorize isolated phrases.
A More Advanced Example
Consider these four sentences:
- Time flies by.
- Time flew by.
- Time has flown by.
- Time had flown by.
All four are correct.
The difference is tense.
Flies is present tense.
Flew is simple past.
Has flown is present perfect.
Had flown is past perfect.
Now compare them with the incorrect version:
Time has flew by.
The problem is specifically the combination has + flew.
The correct combination is:
has + flown
Quick Reference Table
| Form | Correct Example | Main Use |
| Fly | Time will fly by. | Present base form, infinitives, modals, future constructions |
| Flies | Time flies by. | Present tense with “time” |
| Flew | Time flew by. | Simple past |
| Flown | Time has flown by. | Past participle with has, have, or had |
If you remember only one thing, remember this:
“Time has flown by” is correct.
“Time has flew by” is incorrect.
Common Mistakes That Lower Quality
Mistake 1: Using “Flew” After “Has”
The most common error is:
“Time has flew by.”
The correction is:
“Time has flown by.”
The reason is simple. Has requires the past participle, and the past participle of fly is flown.
Mistake 2: Assuming “Flew” and “Flown” Are Interchangeable
They are both associated with past actions, but they have different grammatical jobs.
Flew is the simple past.
Flown is the past participle.
Their meanings overlap, but their sentence structures differ.
Mistake 3: Saying “Time Has Fly By”
Some learners remember that fly is the base form and incorrectly place it after has.
The correct form is:
Time has flown by.
Not:
Time has fly by.
Mistake 4: Confusing “Flown” With “Fly”
The base verb is fly.
The past participle is flown.
For example:
I want to fly.
But:
I have flown.
The helping verb changes the required form.
Mistake 5: Overcorrecting “Time Flew By”
Some people learn that flown is correct in “time has flown by” and then begin using flown everywhere.
That creates another problem.
“Time flown by” is not normally correct as a complete simple-past sentence.
Say:
“Time flew by.”
Or:
“Time has flown by.”
The helping verb determines the form.
Mistake 6: Ignoring the Tense
Instead of memorizing individual expressions, identify the tense.
Ask:
What happened?
Then ask:
Is there a helping verb?
This approach is more reliable than guessing based on which version sounds familiar.
Memory Hacks That Actually Work
Hack 1: Remember “Flew Alone, Flown With Help”
This is one of the easiest memory tricks.
Flew can stand alone.
Flown needs a helping verb.
For example:
Time flew by.
But:
Time has flown by.
Think:
Flew alone. Flown with help.
It is not a perfect rule for every grammatical construction, but it is highly useful for remembering this particular distinction.
Hack 2: Memorize the Three-Part Chain
Learn the verb as a complete sequence:
Fly → Flew → Flown
Do not memorize only fly and flew.
Say the sequence aloud:
Fly, flew, flown.
Then attach a sentence to each form:
Time flies by.
Time flew by.
Time has flown by.
This gives your memory both the verb forms and their grammatical environments.
Hack 3: Look for “Has, Have, Had”
When you see has, have, or had, pause before choosing the verb.
Ask:
What is the past participle?
For fly, the answer is:
flown
So:
- has flown
- have flown
- had flown
This trick also works with other irregular verbs:
- has gone
- has eaten
- has written
- has taken
- has seen
The helping verb is your signal to look for the participle.
Hack 4: Use the “Time Machine” Test
Imagine the sentence as a timeline.
If you are describing something finished in the past:
Time flew by.
If you are looking backward from now and connecting the past with the present:
Time has flown by.
This helps distinguish the grammar and the meaning at the same time.
Hack 5: Keep a Three-Sentence Template
Memorize these:
Time flies by.
Time flew by.
Time has flown by.
These three sentences give you a complete mental model of the verb.
If you encounter “time has flew by,” compare it mentally with your template:
Time has flown by.
The correct form becomes much easier to recognize.
Why Precision Matters for SEO and Authority
Grammar accuracy matters because clear language builds trust. Readers may not consciously identify every grammatical error, but repeated mistakes can make a website, article, business, or educational resource appear less reliable.
For SEO content, this matters even more. Search-focused writing should not simply contain keywords. It should provide clear, accurate, useful information that satisfies the reader’s intent.
Someone searching “time has flew by or time has flown by” is looking for a direct grammar answer. If an article explains the distinction incorrectly, the page fails its primary purpose.
Correct usage also improves readability.
Compare:
“Time has flew by since we started working together.”
with:
“Time has flown by since we started working together.”
The second sentence follows standard English grammar and presents the writer as more careful and authoritative.
Precision Improves Semantic Clarity
Grammar is not only about avoiding mistakes. It can communicate time relationships.
Compare:
“Time flew by.”
with:
“Time has flown by.”
The first presents the passage of time as a past event.
The second connects that passage with the present.
That difference can help readers understand exactly what the writer means.
Precision Supports Professional Credibility
In professional content, small grammar errors can distract readers from important ideas.
A website that consistently uses correct irregular verb forms demonstrates attention to detail.
That is especially valuable for:
- Educational websites
- Grammar resources
- Academic content
- Business websites
- Professional blogs
- SEO articles
- Copywriting portfolios
Correct grammar is therefore part of the broader goal of creating credible, polished, reader-focused content.
A Quick Quiz
Fill in each blank with the correct form of fly.
1. Time has ______ by so quickly.
2. The plane ______ over the mountains yesterday.
3. Time ______ by when you are having fun.
4. We have ______ to several countries for work.
5. The afternoon ______ by while we were talking.
6. I cannot believe how quickly the years have ______ by.
7. The next few weeks will ______ by.
Answer Key
1. flown
The correct sentence is “Time has flown by so quickly.” The word has requires the past participle flown.
2. flew
The correct sentence is “The plane flew over the mountains yesterday.” This describes a completed past action, so the simple past flew is appropriate.
3. flies
The correct sentence is “Time flies by when you are having fun.” This is a general statement, so the present-tense form flies is correct.
4. flown
The correct sentence is “We have flown to several countries for work.” The word have requires the past participle flown.
5. flew
The correct sentence is “The afternoon flew by while we were talking.” The sentence describes a completed past period, so flew works.
6. flown
The correct sentence is “I cannot believe how quickly the years have flown by.” The construction have + past participle requires flown.
7. fly
The correct sentence is “The next few weeks will fly by.” After the modal-like helping verb will, use the base form fly.
The key lesson is straightforward: “time has flown by” is the correct phrase, while “time has flew by” is grammatically incorrect in standard English. Use flew for the simple past, as in “time flew by,” and use flown after has, have, or had, as in “time has flown by.”
Once you connect fly, flew, and flown with their proper grammatical structures, the confusion disappears. When you see has flown, have flown, or had flown, you are looking at the correct past-participle construction. When you see a straightforward past event without a helping verb, flew is usually the right choice.
For quick editing, use this final check: “Has” means “flown,” while simple past means “flew.” That single distinction will prevent the most common mistake and help you write the expression confidently in both casual and professional English.
Conclusion
The correct expression is “time has flown by,” not “time has flew by.” The reason is rooted in the three principal forms of the irregular verb fly: fly, flew, and flown. Flew is the simple past form, so you can correctly say, “Time flew by during our vacation.” However, when the sentence contains has, have, or had, the past participle is required, making “Time has flown by” the grammatically correct choice. This distinction may seem small, but using the right verb form makes your writing clearer, more polished, and more authoritative.
The easiest way to remember the difference is to connect each form with its grammatical role. Say “time flies by” for a general or present statement, “time flew by” for a completed past event, and “time has flown by” when describing time that has passed from the past up to the present. Avoid “time has flew by” in standard English because has + flew is an incorrect verb combination. Once you remember “flew for simple past, flown after has, have, or had,” you can confidently choose the correct expression every time.
Frequently Asked Questions
Is “time has flew by” grammatically correct?
No, “time has flew by” is not grammatically correct in standard English. The correct expression is “time has flown by.” The verb fly has the forms fly, flew, and flown. Because has is a helping verb used with the present perfect tense, it must be followed by the past participle flown, not the simple past form flew.
Is “time has flown by” correct?
Yes, “time has flown by” is completely correct. It uses the present perfect structure has + flown, where flown is the past participle of fly. The expression means that time has passed quickly, usually with a connection between a past period and the present. For example, “Time has flown by since we started this project” is grammatically correct.
Should I say “time flew by” or “time has flown by”?
Both expressions are correct, but they are used in different grammatical contexts. Say “time flew by” when referring to a completed past period, such as “Time flew by during our holiday.” Say “time has flown by” when connecting the passage of time to the present, such as “Time has flown by since we moved here.” The context determines the appropriate form.
What is the difference between “flew” and “flown”?
Flew is the simple past form of fly, while flown is the past participle. For example, “The bird flew away” uses simple past. In contrast, “The bird has flown away” uses the present perfect and therefore requires flown. Remembering this distinction helps you avoid errors such as “has flew,” which should be replaced with “has flown.”
Can I say “time flew by”?
Yes, “time flew by” is grammatically correct and very common. It describes time passing quickly during a completed past event or period. For example, you could say, “Time flew by during our trip to the mountains.” Because there is no helping verb such as has, have, or had, the simple past form flew is appropriate in this sentence.
Can I say “time has flew by” in casual English?
You may hear people say “time has flew by” in informal speech, but it is still considered grammatically incorrect in standard English. Casual usage does not change the established verb forms. If you are writing an article, email, essay, academic assignment, professional message, or website content, use “time has flown by.” It is the correct and polished form.
What is the past tense of “fly”?
The simple past tense of fly is flew. For example, “She flew to London yesterday” is correct. The past participle is flown, as in “She has flown to London several times.” Therefore, the basic sequence is fly, flew, flown. Knowing all three forms is essential because different sentence structures require different forms of this irregular verb.
Why do people confuse “flew” and “flown”?
People often confuse flew and flown because both refer to actions associated with the past, and English contains many irregular verbs with different patterns. In addition, “time flew by” is a familiar phrase, which can make writers incorrectly carry flew into the construction “has flew.” The key is to recognize that has, have, and had require the past participle flown.
Which is correct: “the years flew by” or “the years have flown by”?
Both are correct, but they communicate slightly different perspectives. “The years flew by” describes the years as a completed past period. “The years have flown by” connects their passage with the present and often expresses surprise about how quickly they passed. Choose flew for simple past and have flown for present perfect constructions.
What is an easy way to remember “time has flown by”?
Use the simple memory rule “Flew is past, flown follows has.” Remember the sequence fly, flew, flown, then attach examples to each form: “Time flies by,” “Time flew by,” and “Time has flown by.” Whenever you see has, have, or had, pause and choose flown. This quick check will prevent the most common mistake.
Muhammad Mutahar Hasnat is the founder of gillgrammar.com and a B.Sc. Civil Engineering student. Through his platform, he is dedicated to helping students overcome grammar weaknesses and master English proficiency, ensuring they face no hurdles in digital or any other professional fields and develop a strong command of the language.
