The phrase “time has flew by or time has flown by” is a common grammar question because both versions sound natural in everyday speech. Many people hear “flew” and connect it with the idea of something moving quickly through the air, so they assume it works after “has.” However, only one phrase follows standard English grammar rules.
The correct expression is “time has flown by.” The phrase describes how quickly time seems to pass. It is commonly used when talking about memories, milestones, aging, experiences, or moments that feel shorter than expected.
Understanding the difference between flew and flown helps you avoid a mistake that appears in conversations, writing, social media posts, and professional communication. The issue comes down to knowing how past tense verbs and past participles work.
Here’s why:
The phrase “time has flown by” uses the present perfect tense correctly. The helping verb “has” requires the past participle form of the main verb, and the past participle of fly is flown, not flew.
Let’s make this concrete.
You say:
- Time has flown by so quickly. ✅
- Time flew by so quickly. ✅
- Time has flew by so quickly. ❌
The difference is small, but the grammar rule behind it is important.
The Core Rule Explained Simply
The simplest rule is this:
Use “flown” after helping verbs like has, have, and had. Use “flew” when talking about a completed action in the past without a helping verb.
The verb fly has three main forms:
| Verb Form | Word | Example |
| Base form | fly | Birds fly across the sky. |
| Simple past | flew | The plane flew yesterday. |
| Past participle | flown | The plane has flown many times. |
The confusion happens because flew and flown both refer to the same action. The difference is not meaning, but grammatical position.
The phrase “time has flown by” follows this pattern:
Subject + has/have + past participle
Examples:
- Time has flown by.
- The years have flown by.
- The weekend has flown by.
The phrase “time flew by” follows a different pattern:
Subject + simple past verb
Examples:
- Time flew by last summer.
- The vacation flew by.
- The meeting flew by.
The verb changes because the sentence structure changes.
The Two Primary Sides of the Rule
Side 1: When to Use “Time Has Flown By”
Use “time has flown by” when you use has or have before the verb. This structure connects the past with the present.
The speaker usually means that time passed quickly and the effect is still noticeable now.
Examples:
- Time has flown by since we moved here.
- Time has flown by during this amazing journey.
- It feels like time has flown by since graduation.
The phrase often expresses surprise, nostalgia, or reflection.
It suggests:
Something started in the past, and the passage of time matters now.
Look at this:
“I started college four years ago, and time has flown by.”
The speaker is still thinking about the experience today.
Side 2: When to Use “Time Flew By”
Use “time flew by” when describing a finished period in the past. There is no helping verb before “flew.”
Examples:
- Time flew by during my vacation.
- The afternoon flew by while we talked.
- The school year flew by.
This version focuses on a completed event.
The speaker looks back at a specific moment that already ended.
For example:
“My trip to Italy was amazing. Time flew by.”
The trip is finished, so the simple past form works.
Side-by-Side Comparison Table
| Situation | Example | Meaning | Correct Usage |
| Present connection | Time has flown by this year. | The year is still affecting the present. | Use has flown |
| Finished past event | Time flew by during the concert. | The concert ended quickly. | Use flew |
| Using has/have | The months have flown by. | Months passed quickly until now. | Use flown |
| Talking about yesterday | Yesterday flew by. | A past day passed quickly. | Use flew |
Deep Dive Into Category 1: Using “Time Has Flown By”
The phrase “time has flown by” is the most common choice when people talk about life changes and ongoing experiences.
The key signal is the word before the verb.
If you see:
- has
- have
- had
you need the past participle.
For the verb fly, that means:
- has flown
- have flown
- had flown
Not:
- has flew
- have flew
- had flew
When to Use “Has Flown”
Use has flown with singular subjects.
Examples:
- Time has flown by.
- The year has flown by.
- My childhood has flown by.
The subject “time” is singular, so it pairs with has.
When to Use “Have Flown”
Use have flown with plural subjects.
Examples:
- The years have flown by.
- The months have flown by.
- The days have flown by.
The verb form changes because the subject changes.
Examples in Real Sentences
Incorrect:
“Time has flew by since my first job.”
Correct:
“Time has flown by since my first job.”
Incorrect:
“The last few years has flew by.”
Correct:
“The last few years have flown by.”
The second example contains two mistakes. “Years” is plural, so it needs have, and the verb needs flown.
Here’s a quick test:
Quick Test: Choosing “Flown”
Ask yourself:
Is there a helping verb before the word?
If yes:
Use flown.
Examples:
- Has ___ by? → has flown by
- Have ___ by? → have flown by
- Had ___ by? → had flown by
If there is no helping verb:
Use flew.
Examples:
- Time ___ by yesterday. → time flew by
- The week ___ by. → the week flew by
Deep Dive Into Category 2: Using “Time Flew By”
The phrase “time flew by” is in the simple past tense. It describes something that happened and finished.
The action happened in the past.
The structure is:
Subject + past tense verb
Examples:
- Time flew by.
- The evening flew by.
- The holiday flew by.
There is no need for “has” or “have.”
Patterns With “Flew”
You often use flew with specific completed periods.
Examples:
- The two hours flew by during the movie.
- The weekend flew by before I realized it.
- The summer flew by quickly.
These sentences describe finished experiences.
The listener understands that the period is over.
Common Time Expressions With “Flew”
“Flew” often appears with words like:
- yesterday
- last week
- last year
- during the trip
- during the event
- that afternoon
Examples:
- The vacation flew by.
- The holiday weekend flew by.
- The final semester flew by.
These phrases point to a completed time period.
The Meaning Shift or Nuance
The difference between “time has flown by” and “time flew by” is subtle because both describe time passing quickly.
The main difference is the speaker’s viewpoint.
“Time has flown by” feels connected to the present.
It often means:
“I cannot believe how quickly things have changed up to now.”
Example:
“Time has flown by since my daughter was born.”
The speaker is still experiencing the results of that passage of time.
“Time flew by” feels like a reflection on a finished moment.
Example:
“My vacation flew by.”
The vacation is over, and the speaker is looking back.
The emotional difference matters too.
“Time has flown by” often sounds more reflective.
“Time flew by” often sounds more like a simple observation.
Both are correct when used in the right structure.
Why the Confusion Persists
The confusion exists because English has many irregular verbs that change differently in different situations.
For regular verbs, the past tense and past participle are usually identical.
Examples:
- walk, walked, walked
- play, played, played
- work, worked, worked
Because of this pattern, many speakers expect:
fly, flew, flew
But irregular verbs do not follow that rule.
The correct forms are:
- fly
- flew
- flown
The problem becomes stronger because “flew” sounds complete.
A sentence like:
“Time flew by”
sounds perfectly natural.
When speakers add “has,” they may keep the same word:
“Time has flew by.”
However, English requires the third form after “has.”
Another reason is everyday speech.
People sometimes use incorrect forms casually, especially in informal conversations. Repeated exposure can make incorrect grammar sound acceptable.
Education also plays a role.
Many learners memorize vocabulary meanings but do not always practice verb forms. Knowing that fly means move through the air is not enough. You also need to know how the verb changes in different sentence structures.
Formal vs Casual Contexts
The choice between “time has flown by” and “time flew by” does not change based on formality alone. The grammar rule stays the same in professional writing, academic work, casual conversations, and online communication.
However, the situations where each phrase appears can differ.
In formal writing, “time has flown by” is often used when reflecting on progress, achievements, or long-term experiences.
Examples:
- “It is hard to believe that time has flown by since the organization was founded.”
- “Time has flown by as researchers have worked toward this important discovery.”
This structure sounds polished because it connects past events with the current moment.
In casual conversations, people frequently use both versions correctly.
Examples:
- “I can’t believe it, time has flown by.”
- “That movie was three hours long, but time flew by.”
The important thing is not whether the sentence is formal or casual. The important thing is whether the sentence uses a helping verb.
Here’s the simple rule:
Has, have, or had = flown.
No helping verb in the past = flew.
Look at this:
Formal:
“Five years have flown by since the company launched.”
Casual:
“Wow, those five years flew by.”
Both are correct because the grammar matches the structure.
Case Studies / Pop Culture Examples
The idea that time passes quickly appears everywhere in culture, storytelling, education, and everyday life.
People often use these expressions when discussing major life moments.
Case Study 1: Graduation Memories
A student might say:
“Time has flown by since my first day of college.”
This works because college started in the past, but the person is reflecting on the entire experience now.
Another person might say:
“The four years flew by.”
This works because the four-year period is complete.
The meaning is similar, but the grammatical viewpoint changes.
Case Study 2: Movies and Television
After watching a long movie, someone may say:
“The movie flew by.”
They are describing a completed viewing experience.
After finishing a long-running television series, someone might say:
“Time has flown by since the show first premiered.”
The phrase connects the past premiere date to the present.
Case Study 3: Personal Milestones
Parents often use these expressions when talking about children growing up.
Example:
“Time has flown by. I still remember when my child was a toddler.”
The speaker connects memories from the past to their current feelings.
A different example:
“The baby years flew by.”
This describes a completed stage of life.
Case Study 4: Workplace Experiences
Employees often use these phrases when celebrating anniversaries.
Correct:
“Ten years have flown by since I joined this company.”
Also correct:
“My first year at the company flew by.”
The first sentence focuses on the journey until now.
The second focuses on a completed year.
Advanced Scenarios & Flowchart
Use this decision guide to choose the correct phrase:
Start:
Are you using has, have, or had before the verb?
Yes
Use the past participle form.
Fly → flown
Example:
Time has flown by.
No
Is the action finished in the past?
Yes
Use the simple past form.
Fly → flew
Example:
Time flew by.
No
Use another verb structure depending on the sentence.
Example:
Time flies when you are having fun.
Another quick decision method:
Sentence: “Time ___ by.”
“Time has ___ by”
Correct answer: flown
“Time ___ by yesterday”
Correct answer: flew
“Time is ___ by”
Correct answer: flying
“Time ___ when you enjoy yourself”
Correct answer: flies
The verb form depends completely on the surrounding words.
Quick Reference Table
| Phrase | Rule | Example |
| Time has flown by | Use after has/have/had | Time has flown by so quickly this year. |
| Time flew by | Use for completed past events | Time flew by during our vacation. |
| Time flies | Use for general truths | Time flies when you are having fun. |
| Time is flying | Use for something happening now | Time is flying during this semester. |
Common Mistakes That Lower Quality
Even experienced speakers sometimes make mistakes with fly, flew, and flown. These errors happen because the words are closely related.
Mistake 1: Using “Flew” After “Has”
Incorrect:
“Time has flew by.”
Correct:
“Time has flown by.”
The word “has” requires the past participle.
Mistake 2: Using “Flown” Without a Helping Verb
Incorrect:
“Time flown by last weekend.”
Correct:
“Time flew by last weekend.”
Without a helping verb, the sentence needs the simple past form.
Mistake 3: Confusing Sound With Grammar
Some speakers choose the word that sounds more natural.
However, grammar is not based only on sound.
“Flew” sounds complete, but it cannot replace “flown” after a helping verb.
Mistake 4: Forgetting Subject Agreement
Incorrect:
“The years has flown by.”
Correct:
“The years have flown by.”
The subject “years” is plural.
Mistake 5: Mixing Verb Forms
Incorrect:
“Time has flew quickly and I cannot believe it.”
Correct:
“Time has flown quickly, and I cannot believe it.”
Using mixed verb forms makes writing appear less polished.
Memory Hacks That Actually Work
Remembering irregular verbs becomes easier when you connect them to patterns.
Memory Hack 1: The Three-Step Fly Pattern
Memorize this simple sequence:
Fly → Flew → Flown
Think:
- Today: fly
- Yesterday: flew
- Has happened: flown
Examples:
Today:
“The birds fly.”
Yesterday:
“The birds flew.”
Completed experience:
“The birds have flown.”
Memory Hack 2: The “Helping Hand” Rule
Imagine helping verbs like has and have hold hands with the third verb form.
When they appear, they pull flown into the sentence.
Examples:
- Has + flown
- Have + flown
- Had + flown
Not:
- Has + flew
- Have + flew
- Had + flew
Memory Hack 3: Compare With Other Irregular Verbs
Many English verbs follow a similar pattern.
Examples:
Write:
- write
- wrote
- written
Break:
- break
- broke
- broken
Speak:
- speak
- spoke
- spoken
Fly:
- fly
- flew
- flown
The third form is often used after helping verbs.
Memory Hack 4: Ask “When?”
Ask yourself:
Am I talking about a finished past moment?
If yes:
Use flew.
Example:
“The weekend flew by.”
Am I connecting the past to now?
If yes:
Use flown.
Example:
“The years have flown by.”
Why Precision Matters (SEO/Authority)
Correct grammar improves trust.
When readers see accurate language, they are more likely to view the writer as knowledgeable and reliable.
This matters especially for SEO content, blogs, educational articles, business pages, and professional communication.
Search engines evaluate content quality through many signals, including usefulness, clarity, and reader experience. While a single grammar mistake will not decide rankings, repeated language errors can reduce credibility.
A phrase like “time has flew by” may distract readers because it signals weak grammar control.
For content creators, precision matters because small mistakes can affect:
Professional image
A well-written article shows attention to detail.
Reader confidence
People trust information that is clearly communicated.
Authority
Correct language supports expertise.
Communication quality
The right phrase delivers the intended meaning without confusion.
Grammar is not only about rules. It is about making ideas easier to understand.
Using “time has flown by” correctly shows control over English structure.
A Quick Quiz
Fill in the blanks with the correct form of the verb.
1. Time has ______ by so quickly this year.
Answer: __________
2. The summer ______ by before we realized it.
Answer: __________
3. The last five years have ______ by.
Answer: __________
4. My vacation ______ by faster than expected.
Answer: __________
5. I cannot believe how quickly time has ______ by since graduation.
Answer: __________
6. The days ______ by while we were traveling.
Answer: __________
7. Time ______ when you are enjoying yourself.
Answer: __________
Quiz Answers
- flown
- flew
- flown
- flew
- flown
- flew
- flies
Conclusion
The correct phrase is “time has flown by,” while “time has flew by” is grammatically incorrect in standard English. The confusion happens because flew is the past tense form of “fly,” but after helping verbs like has, have, and had, English requires the past participle form, which is flown. Remembering the simple pattern fly, flew, flown makes this rule much easier to apply. When you say “time has flown by,” you are connecting the past with the present and expressing how quickly a period seems to have passed.
Using the right phrase improves both everyday communication and professional writing. Although many people understand what someone means when they say “time has flew by,” accuracy matters when creating polished content, writing professionally, or learning English grammar. The phrase “time flew by” is still correct when describing a completed event in the past, while “time has flown by” works for experiences that continue to matter now. Choosing the correct verb form helps your writing sound natural, confident, and grammatically precise.
Frequently Asked Questions
Is “time has flew by” correct English?
No, “time has flew by” is not considered correct in standard English. The verb “fly” has three forms: fly, flew, flown. When a sentence uses “has,” the verb must be in its past participle form, so the correct phrase is “time has flown by.” The incorrect version happens because many speakers remember “flew” as the past form and use it in every situation.
What is the correct phrase, “time has flew by” or “time has flown by”?
The correct phrase is “time has flown by.” The word “has” changes the grammar structure and requires the past participle form of the verb. Since “flown” is the past participle of “fly,” it must follow “has.” The phrase means that time has passed quickly from some point in the past until now.
When should I use “time flew by”?
Use “time flew by” when you are talking about a completed event or period in the past. For example, you can say, “The weekend flew by” or “My vacation flew by.” In these sentences, the event has already ended, so the simple past form flew is the correct choice.
When should I use “time has flown by”?
Use “time has flown by” when the passage of time connects to the present moment. This phrase is often used when reflecting on life changes, achievements, relationships, or experiences that started in the past and are still meaningful now. For example, “Time has flown by since I started my new job.”
Why do people confuse flew and flown?
People often confuse flew and flown because both words come from the same verb and describe the same action. The difference is grammatical rather than meaning-based. Many learners know that “flew” is the past form of “fly” but forget that irregular verbs often have a separate past participle form used with helping verbs.
Can I say “time has gone by quickly” instead of “time has flown by”?
Yes, “time has gone by quickly” is a correct alternative. Both phrases describe the quick passing of time, but they have slightly different feelings. “Time has flown by” often suggests surprise or amazement at how quickly time passed, while “time has gone by quickly” sounds more neutral and straightforward.
Is “time has flown by so fast” grammatically correct?
Yes, “time has flown by so fast” is commonly used and grammatically acceptable. The phrase emphasizes that time passed more quickly than expected. In more formal writing, some people prefer “time has flown by so quickly,” but “so fast” is widely accepted in modern English conversations and writing.
How can I remember whether to use flew or flown?
A simple memory trick is to remember the pattern fly, flew, flown. Use flew for simple past sentences, such as “The day flew by.” Use flown after helping verbs like has, have, or had, such as “The years have flown by.” Checking the words before the verb usually reveals the correct choice.
Is “time flies by” also correct?
Yes, “time flies by” is correct, but it has a different meaning. It is used for general statements or repeated truths, such as “Time flies when you are having fun.” Unlike “time has flown by,” it does not focus on a specific period that started in the past and continues to the present.
Which phrase sounds more natural, “time flew by” or “time has flown by”?
Both phrases sound natural when used correctly. “Time flew by” is common when talking about a finished experience, such as a trip or event. “Time has flown by” is more common when reflecting on a longer period connected to the present, such as years passing or major life changes.
Grace Walker is a passionate writer and English language enthusiast who enjoys making everyday English clear, practical, and easy to understand. At Grammarzcore, she creates helpful content about grammar, word meanings, sentence usage, and common language questions. Her writing turns confusing topics into simple explanations that readers can use with confidence. Grace aims to help students, professionals, and everyday learners communicate more clearly, naturally, and effectively while developing a stronger understanding of the English language through useful, engaging, and reliable guidance.