Began vs Begun: When to Use Each Form of "Begin"

Use began for the simple past, with no helping verb: The concert began at eight. Use begun only after a form of have or be: The concert has begun, The work had begun, Construction was begun in 1890.

That is the whole rule. Begin is an irregular verb with three distinct forms (begin, began, begun), and the mistakes happen when people swap the last two. The good news is that a single question, "Is there a helping verb?", fixes nearly every case.

Quick answer: Began stands alone: She began her new job yesterday. Begun needs a helper (have, has, had, is, was, been): She has begun her new job. Never write has began or I begun.

On this page

1. The three forms of "begin"
2. Why "begin" behaves this way
3. When to use "began"
4. When to use "begun"
5. Trickier sentence patterns
6. Begin, start or commence?
7. Began vs begun at a glance
8. 25 example sentences
9. US vs UK vs Australia
10. Common mistakes
11. Memory tricks
12. Practice quiz
13. Other irregular verbs worth reviewing
14. Quick self-check for your own writing

The three forms of "begin"

Pronunciation

• begin: bih-GIN
• began: bih-GAN (rhymes with can)
• begun: bih-GUN (rhymes with sun)

The vowel change is the only difference you hear, and it is a useful clue. The a form is for a single completed event in the past; the u form appears in perfect tenses and passives.

Why "begin" behaves this way

Begin is a very old English verb. It goes back to Old English beginnan, and it belongs to a group that linguists call strong verbs. Instead of adding -ed to make the past tense, strong verbs change their internal vowel. Most strong verbs have vanished or become regular over the centuries, but a handful of very common ones held on.

Begin shares its vowel pattern (i → a → u) with a recognizable family:

If you are confident with sing, sang, sung, you already know how begin works. Swap begin into any sentence with sing and the right form appears: She sang / she began; She has sung / she has begun.

Not every verb that looks similar follows the pattern. Bring becomes brought, not brang or brung, and swing uses swung for both past forms. So the family is a guide, not a universal law.

When to use "began"

Use began for an action that started at a specific point in the past and is told as a simple completed fact. There is no helping verb in front of it.

• The rain began just after lunch.
• I began learning Spanish when I moved to Texas.
• The Industrial Revolution began in Britain in the eighteenth century.

Began often appears with time markers such as yesterday, last week, in 2015, at noon or when I was a child. Those markers point to a finished moment, which is exactly what the simple past expresses.

"Began" with infinitives and -ing forms

Began is frequently followed by to + verb or a verb ending in -ing. Both are correct, and the meaning is nearly identical.

• It began to snow. / It began snowing.
• She began to laugh. / She began laughing.

A small stylistic tip: when the main verb is already in the -ing form ("beginning"), the infinitive usually sounds smoother. "It was beginning to rain" is more natural than "It was beginning raining."

When to use "begun"

Use begun whenever a helping verb comes before it.

Perfect tenses (with have, has, had)

• The match has begun. (present perfect)
• By the time I arrived, the meeting had begun. (past perfect)
• By next spring, work will have begun on the new stadium. (future perfect)
• She must have begun the project early. (modal perfect)

Passive voice (with be)

• Repairs were begun last summer but never finished.
• The investigation has been begun by an independent panel.

The passive with begun is grammatically correct but can sound stiff. In everyday writing, many people rephrase: "Repairs started last summer" or "Work on the repairs began last summer."

Adjective-like uses

Occasionally begun appears without an auxiliary in fixed expressions, where the helper is understood:

• Well begun is half done. (a proverb, meaning a good start makes the rest easier)
• Once begun, the process cannot be stopped.

In both cases, a helping verb is implied: "What is well begun is half done" and "Once it has begun."

Trickier sentence patterns

Simple sentences rarely cause trouble. The errors creep in when the helping verb is separated from the main verb, hidden in a question, or contracted.

Questions and negatives

In questions, the helping verb jumps to the front, so it can be easy to lose track of it.

• Has the ceremony begun? (helper: has)
• Had they begun before you got there? (helper: had)
• When did the ceremony begin? (helper: did, so use the base form)

That last example catches people out. After did, does or do, you need the plain base form, begin, not began. "When did it began?" is a common error. The same applies to negatives: "It didn't begin on time," not "It didn't began on time."

Contractions

Contractions hide the helping verb inside a short form, but it is still there.

• We've begun = we have begun
• She'd begun = she had begun
• It's begun = it has begun

The contraction it's can mean it is or it has. In "It's begun to rain," it means it has, which is why begun is correct. If you want to check, expand the contraction in your head.

Words between the helper and the verb

Adverbs often sit between the helper and begun, and they can make you forget the helper is there.

• The team has already begun.
• We had only just begun.
• Engineers have finally begun testing the new engines.

Read past the adverb to find the helper. If has, have or had appears anywhere earlier in the verb phrase, the participle begun is the right choice.

Reported speech

When you report what someone said in the past, the tense usually shifts back one step, and that can move you from began to had begun.

• Direct: "The show began at seven," she said.
• Reported: She said the show had begun at seven.

In casual reporting, many writers simply keep began ("She said the show began at seven"), and that is acceptable when the time sequence is obvious. But if you use had, the participle must follow.

Begin, start or commence?

Because start is a regular verb (start, started, started), some writers use it to sidestep the began/begun choice altogether. That is perfectly legitimate, but the words are not always interchangeable.

You can say "the engine started" but not "the engine began" in the sense of firing up. Commence is useful in announcements ("Boarding will commence shortly") but can sound pompous in ordinary emails.

Began vs begun at a glance

25 example sentences

Everyday

1. The kids began their summer holidays with a trip to the Gold Coast.
2. Have you begun packing for the move yet?
3. My dad began running marathons in his fifties.
4. The movie had already begun when we found our seats.
5. It began to hail just as we reached the car park.
6. I've begun keeping a journal, and it's helping me sleep.

Workplace and email

7. "The audit began on Monday and should finish by the end of the month."
8. "We have begun reviewing applications and will be in touch shortly."
9. Our team in Atlanta began using the new software in April.
10. "By the time the client called, we had already begun drafting the proposal."
11. Negotiations began well but stalled over pay.
12. "Onboarding has begun for all new starters in the Leeds office."

Academic

13. The study began in 2018 with a sample of 400 households.
14. Scholars have long debated when the Renaissance truly began.
15. By the late nineteenth century, industrial towns had begun to transform the landscape of northern England.
16. Data collection has begun, but analysis will take another year.

News style

17. Voting began at 8 a.m. across Victoria.
18. Demolition of the old stadium has begun, the council confirmed.
19. The trial began on Tuesday in a packed Manhattan courtroom.
20. Evacuations had begun hours before the cyclone crossed the coast near Cairns.

Literary and figurative

21. Their friendship began with an argument about cricket.
22. A new chapter had begun, and she knew it.
23. The light began to fade over the moors.
24. What had begun as a joke soon became a business.
25. Well begun is half done, as my grandmother in Dundee used to say.

US vs UK vs Australia

There is no difference in the standard forms. Began is the simple past and begun is the past participle in American, British and Australian English alike, and formal writing in all three countries follows the same rule.

The differences are in informal and dialect speech:

• United States: Some regional and rural varieties use begun as a simple past ("I begun work at six") or occasionally began as a participle. These are recognized dialect features, but they are not used in standard writing.
• United Kingdom: Several regional dialects in England and Scotland also use non-standard past forms of strong verbs, such as begun for began or sung for sang. You may hear them in conversation, but editors and examiners expect the standard forms.
• Australia: Similar informal variation exists in casual Australian speech, but standard Australian English follows the same rule as British and American English.

Interestingly, the pattern behind these dialect forms is the same in all three countries: speakers simplify the three-form verb into two forms. That is how swing and cling ended up with one past form each centuries ago, but begin has not followed them into standard English.

Common mistakes

❌ The meeting has began. ✅ The meeting has begun.

❌ I begun my apprenticeship last year. ✅ I began my apprenticeship last year.

❌ By noon, the rain had began. ✅ By noon, the rain had begun.

❌ We begun to worry when she didn't call. ✅ We began to worry when she didn't call.

❌ Work on the bridge was began in 2020. ✅ Work on the bridge was begun in 2020. (or, more naturally: Work on the bridge began in 2020.)

❌ The season is begining next week. ✅ The season is beginning next week.

❌ The festival begun with fireworks over the Thames. ✅ The festival began with fireworks over the Thames.

The begining error is a spelling slip rather than a tense mistake, but it often appears in the same sentences. Because the stress falls on the last syllable of begin, the n doubles before -ing, just as in admitting and forgetting.

Memory tricks

"A" stands alone, "U" needs a partner

Began has an a, and it stands alone. Begun has a u, and it always comes with us, a helper (have, has, had, was). If you can see a helping verb, use the u. If you can't, use the a.

The sing test

When in doubt, replace begin with sing in your sentence:

• The choir has ___ (sung) → The meeting has begun.
• She ___ (sang) beautifully → She began quickly.

Because sing, sang, sung is so familiar, the right vowel almost always jumps out.

Practice quiz

Fill in the blank with began or begun.

1. The concert at the Sydney Opera House ______ exactly on time.
2. Have the renovations ______ yet?
3. By the time the police arrived, the crowd had ______ to leave.
4. Our book club ______ reading a new novel last Thursday.
5. Repairs to the roof were ______ before the storm.
6. Choose the correct sentence: (a) I have began a new course. (b) I began a new course. (c) I begun a new course.

Answers

1. began: simple past with no helping verb.
2. begun: follows the helping verb have.
3. begun: follows had (past perfect).
4. began: simple past; "last Thursday" marks a finished time.
5. begun: passive voice after were.
6. (b): began stands alone; (a) needs begun and (c) needs began.

Other irregular verbs worth reviewing

Irregular verbs cause the same kind of trouble in many places. If you sometimes hesitate over past forms, look at lead vs led, where the past tense looks nothing like the present, and lie vs lay, the most famously tangled irregular pair in English. For a verb with two accepted past participles, see proved vs proven, and for a regional twist on participles, see got vs gotten.

Quick self-check for your own writing

Before you send an email or submit an essay, search the document for began and begun. For each one, look immediately to the left: if you see have, has, had, is, was, were or been, it should be begun; if not, it should be began. That ten-second scan catches almost every error.