Vietnamese commonly asks whether an event has occurred at any point in a person's experience with có ... bao giờ: Bạn có bao giờ đi lạc ở Hà Nội không? “Have you ever got lost in Hà Nội?” Here có opens a yes-or-no proposition and bao giờ widens the relevant time to “at any time.” Neither word conjugates the verb into an English present perfect.
The pattern is neutral in both (informal) conversation and (formal) interviews. Its interpretation comes from the open time range, the kind of event, and the discourse context. This page concentrates on open life-experience questions and their answers. Bắt đầu, which selects the beginning of a situation, is treated separately on Bắt Đầu and Ingressive Aspect.
The basic question frames
Two very common frames are:
subject + có + bao giờ + predicate + không?
subject + có + bao giờ + predicate + chưa?
Bạn có bao giờ ngủ quên trên xe buýt không?
Have you ever fallen asleep on a bus?
Chị có bao giờ phải thuyết trình bằng tiếng Anh chưa?
Have you ever had to give a presentation in English?
Bố có bao giờ hối hận vì đã chuyển vào đây không?
Has Dad ever regretted moving here?
Sentence-final không asks for a plain yes-or-no decision. Final chưa presents the experience as unrealized so far and asks whether that boundary has been crossed. With life experiences the practical difference is often small, but chưa makes “up to now” more audible. Answers are normally có / rồi for a positive answer and chưa / chưa bao giờ for a negative one.
— Em có bao giờ tự đi du lịch chưa? — Rồi, em từng đi Đà Nẵng một mình.
— Have you ever travelled by yourself? — Yes, I once went to Đà Nẵng alone.
The answer naturally switches to từng, which presents the trip as a past experience. Repeating the whole question frame is possible—Có, em có đi một lần rồi—but is not required.
What falls inside the scope
In the neutral order, có precedes bao giờ, and both take scope over the following predicate. The object and complements determine exactly which experience is being queried.
Anh có bao giờ ăn phở ở quán này không?
Have you ever eaten phở at this restaurant?
Anh có bao giờ ăn phở bằng đũa không?
Have you ever eaten phở with chopsticks?
The first question searches for the experience eat phở at this restaurant; the second searches for eat phở with chopsticks. A topic may appear first in (informal) conversation: Quán này, anh có bao giờ ăn chưa? “Have you ever eaten at this place?” That fronting is discourse organization, not a change of tense.
With stative predicates, the pattern can ask whether a feeling or condition has ever held, not whether a bounded action occurred.
Có bao giờ bạn thấy mình không thuộc về nơi nào cả không?
Have you ever felt that you didn't belong anywhere?
Because thấy introduces an experienced mental state, no English-like have + past participle is needed. The time range supplied by bao giờ and the current conversational reference point are enough.
Có bao giờ, đã bao giờ, and chưa bao giờ
| Pattern | Communicative job | Typical force |
|---|---|---|
| có ... bao giờ ... không/chưa? | opens an experience question | ever? |
| đã bao giờ ... chưa? | explicitly searches prior-to-now experience | have you ever yet? |
| từng + predicate | asserts prior experience | once / have before |
| chưa bao giờ + predicate | denies an occurrence up to now | have never |
| không bao giờ + predicate | strong general or prospective negation | never / will never |
Bạn đã bao giờ nghĩ đến chuyện đổi nghề chưa?
Have you ever thought about changing careers?
Đã bao giờ ... chưa? is extremely common. Đã makes the prior search interval explicit; it is not obligatory merely because English uses have. In the negative answer, chưa bao giờ is often safer than không bao giờ: chưa leaves open the possibility that the experience may occur later, whereas không bao giờ can sound categorical.
Tôi chưa bao giờ đi máy bay, nhưng tháng sau tôi sẽ bay vào Huế.
I have never flown before, but next month I will fly to Huế.
Tôi không bao giờ uống cà phê sau tám giờ tối.
I never drink coffee after eight in the evening.
The second is a habitual rule, not merely a report about life experience so far.
Experience is not a tense paradigm
Compare the viewpoints in this compact decision aid:
| Form | What it contributes |
|---|---|
| đã ăn | the eating is realized before a reference point |
| đang ăn | the eating is in progress |
| sẽ ăn | the eating is projected |
| ăn rồi | completion or a currently relevant change |
| từng đi | going is part of prior experience |
| mới đến / vừa đến | the arrival is recent |
| chưa xong | completion has not been reached |
| sắp mưa | rain is imminent |
| vẫn chờ | waiting continues despite time or expectation |
An adverbial may locate the search window: Trước khi vào đại học, bạn có bao giờ sống xa nhà chưa? asks about any such experience before university. An unmarked predicate can narrate the answer once time is established: Năm mười tám tuổi, tôi chuyển vào Sài Gòn “At eighteen, I moved to Sài Gòn.” Vietnamese does not need to keep stamping every clause with đã.
Trước chuyến đi ấy, cô có bao giờ lái xe đường dài chưa?
Before that trip, had you ever driven a long distance?
English uses had driven because the reference point is in the past. Vietnamese lets trước chuyến đi ấy establish that point and bao giờ ... chưa search the earlier interval. This is why treating đã as a universal past tense obscures the system.
Rhetorical and discourse uses
Có bao giờ ... đâu or a contextually emphatic có bao giờ ...? may be rhetorical, especially in (informal) speech. Intonation and a negative continuation show that no genuine information request is intended.
Tôi có bao giờ quên sinh nhật em đâu!
It's not as if I ever forget your birthday!
Here the bracketing có ... đâu rejects an accusation. Do not interpret it as a neutral life-experience question simply because bao giờ appears.
A dialogue where the frame matters
— Cậu có bao giờ đi lặn chưa? — Chưa bao giờ. Tớ từng học bơi, nhưng chưa từng lặn ở biển. — Cuối tuần này bọn mình sẽ học với huấn luyện viên. Nếu cậu vẫn lo thì cứ đứng xem trước.
— Have you ever gone diving? — Never. I have learned to swim before, but I've never dived in the sea. — This weekend we'll learn with an instructor. If you're still worried, just watch first.
The first line opens the speaker's entire relevant experience. Chưa bao giờ gives the broad negative answer; từng học then asserts a related experience, while chưa từng lặn narrows what remains unrealized. Sẽ projects the plan and vẫn marks continuing concern. Each item contributes a viewpoint; none is a verb ending.
Common Mistakes
1. Copying English have with mandatory đã. Có ... bao giờ already forms a complete experience question.
❌ Bạn có đã bao giờ đến Cần Thơ không?
Incorrect—có đã is not the neutral ordering for this question.
✅ Bạn có bao giờ đến Cần Thơ không?
Have you ever been to Cần Thơ?
2. Using rồi as an automatic present-perfect marker. Rồi adds completion or change and does not mean “ever.”
❌ Bạn đi Huế rồi bao giờ chưa?
Incorrect word order for asking about life experience.
✅ Bạn đã bao giờ đi Huế chưa?
Have you ever been to Huế?
3. Answering a so-far question with categorical không bao giờ unintentionally. Use chưa bao giờ when “not yet in my life” is intended.
❌ Tôi không bao giờ đi nước ngoài.
This means ‘I never go / will never go abroad,’ stronger than a neutral report of no experience so far.
✅ Tôi chưa bao giờ đi nước ngoài.
I have never been abroad (so far).
4. Adding đã to every clause in a past story. A time phrase can locate the event by itself.
❌ Năm ngoái tôi đã đã đi Huế, rồi tôi đã đã gặp một người bạn.
Incorrect—đã cannot be doubled to reproduce English past marking.
✅ Năm ngoái tôi đi Huế, gặp một người bạn và ở đó ba ngày.
Last year I went to Huế, met a friend, and stayed there for three days.
Key Takeaways
- Use có ... bao giờ ... không/chưa? to search an open experience interval.
- Use từng for a positive prior experience and chưa bao giờ / chưa từng for none up to the reference point.
- Đã bao giờ ... chưa? makes prior orientation explicit, but đã is not an obligatory equivalent of English have.
- Let context, event type, temporal adverbials, and viewpoint particles work together; do not build an English-style tense paradigm.
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- Mới...Đã and Earlier-than-Expected ChangeB1 — Use mới...đã to contrast a barely reached first stage with a second event or state that is already true.
- Bắt Đầu and Ingressive AspectB1 — Use bắt đầu to select the onset of an action, state, or new phase without turning it into a tense form.
- Từng for Past ExperienceA2 — Use từng to present an event, role, or state as part of someone's prior experience rather than as one dated narrative event.
- Chưa for Not-Yet and Experiential QuestionsA2 — Use chưa to present an expected event as unrealized so far and to ask whether a relevant boundary has been reached.