Gì for What | Vietnamese Grammar

Vietnamese gì asks “what” when the missing information is a thing, an action, or a type. It normally stays exactly where the answer would appear: Bạn ăn phở “You are eating phở” becomes Bạn ăn gì? “What are you eating?” There is no fronting, inversion, or Vietnamese equivalent of English question-forming do.

This page focuses on open questions with gì. Choosing one member of an understood set is the job of nào, covered on Nào for Which.

Replace the unknown information in place

As a verb's object, gì follows the verb. After a noun, it can ask what kind of thing is meant. Cái gì is a free-standing “what/what thing,” especially when the missing item is the subject.

Trưa nay anh muốn ăn gì?

What do you want to eat for lunch today?

Em đang tìm gì trong ngăn kéo thế?

What are you looking for in the drawer? (informal)

Cái gì đang kêu ngoài ban công vậy?

What is making that noise on the balcony? (informal)

Compare the answer positions: Anh muốn ăn bún chả → Anh muốn ăn gì?; Tiếng chuông đang kêu → Cái gì đang kêu? English places what first in both, but Vietnamese only has initial cái gì when it actually fills the subject slot.

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Build a plausible answer first, then substitute gì: Em mua vé tàu → Em mua gì? If the word stays in the answer's slot, the question will usually have natural Vietnamese order.

Gì after verbs and nouns

The structure around gì narrows the kind of answer expected.

Pattern	Typical meaning	Possible answer
verb + gì	what object/action?	Đọc báo.
noun + gì	what kind/type?	Nhạc jazz.
cái gì predicate	what thing as subject?	Máy giặt bị hỏng.
để làm gì	for what purpose?	Để mở hộp.
có gì ... không	anything in a polar frame?	Có / Không có.

Chị thường nghe nhạc gì khi làm việc?

What kind of music do you usually listen to while working?

Cái dụng cụ nhỏ này dùng để làm gì?

What is this small tool used for?

Trong hộp còn có gì không?

Is there anything else in the box?

In the last example, gì occurs inside the polar frame có...không and is interpreted as “anything,” rather than asking the open content question Trong hộp có gì? “What is in the box?” The final particle changes the requested answer.

Open information, polarity, and confirmation

Use the full contrast below to identify the question type before choosing a particle.

Form	Missing information	Expected response
Bạn khỏe không?	whether the friend is well	positive or negative predicate
Anh có đi không?	whether he will go	đi / không đi
Ai đến?	person	a person's identity
Đi đâu?	destination	a place
Phải không?	confirmation	confirmation or correction
Được chứ?	acceptability	agreement or refusal
Ăn gì?	food or dish	the relevant food

An ordinary gì question needs no final không: Mọi người đang bàn gì? asks for the topic. If the speaker already proposes a topic, confirmation is more suitable.

When the possible answers are explicitly named, use hay instead of asking an unrestricted gì question.

Anh muốn uống trà hay cà phê?

Would you like tea or coffee?

Anh muốn uống gì? leaves the drink open; the hay question restricts the response to the two proposed alternatives (unless the listener rejects that choice).

Mọi người đang bàn kế hoạch nghỉ hè, phải không?

Everyone is discussing the summer vacation plan, right?

Anh mua máy pha cà phê mới à?

Oh, you bought a new coffee machine? (informal reaction)

Phải không? indicates that the speaker thinks the proposition may be correct. Final à often reacts to newly acquired information. Neither is a decorative question marker. For a neutral identity request, remove the proposed answer: Anh mua gì?

Presupposition and the scope of the question

Em đã làm gì với điện thoại của chị? normally presupposes that the listener did something relevant to the phone, and in a tense situation it can sound accusatory. A less presupposing polar question might be Em có cầm điện thoại của chị không? “Did you take my phone?” The two forms do not differ only in vocabulary; they invite different kinds of defense or explanation.

Sáng nay bên kỹ thuật đã thay đổi gì trong hệ thống?

What did the technical team change in the system this morning?

Bên kỹ thuật có thay đổi gì trong hệ thống không?

Did the technical team change anything in the system?

The first assumes some change and asks for its content. The second first checks whether any change occurred. This distinction is useful in careful professional communication (formal) because an open gì question can accidentally build an unproven claim into the conversation.

In everyday conversation, Gì vậy? “What is it?/What's happening?” and Gì thế? are common (informal) elliptical questions. Tone and relationship matter: a sharp Gì? can sound impatient, while a full clause and suitable address term are safer with strangers or seniors.

Có chuyện gì vậy em?

What's going on? (older speaker to younger person, concerned)

Thưa anh, tôi cần chuẩn bị những giấy tờ gì ạ?

Excuse me, what documents do I need to prepare, sir? (formal/deferential)

The respectful frame uses thưa anh, neutral tôi, and ạ. Những giấy tờ gì asks what documents are required as a category; giấy tờ nào would instead select from an understood list. Sentence-final hả is common in casual speech when seeking an answer or expressing surprise—Em nói gì hả?—but can sound confrontational with the wrong intonation. Ư is elevated, literary, or deliberately stylized in many modern contexts rather than a neutral everyday substitute for ạ.

Responses and negative questions

Answer with the missing content, usually with enough of the predicate to anchor meaning.

— Tối nay mình nấu gì? — Mình nấu canh chua nhé.

— What shall we cook tonight? — Let's make sour soup.

With a negative question, do not import an ambiguous English yes/no. State whether anything happened and name it if relevant.

— Em không mua gì ở chợ à? — Có, em mua rau và một ít trái cây.

— Didn't you buy anything at the market? — I did; I bought vegetables and some fruit.

— Anh chưa ăn gì hả? — Chưa, từ sáng đến giờ anh bận quá.

— Haven't you eaten anything? — Not yet; I've been too busy since this morning. (informal)

Có in the first answer rejects the negative assumption, while the following clause supplies the actual purchases. Chưa in the second confirms that eating has not happened yet. A full answer is clearer than a bare token whose orientation an English speaker might reverse.

A natural dialogue

— Máy in lại báo lỗi gì vậy? — Màn hình ghi là hết giấy, nhưng khay vẫn còn đầy.

— What error is the printer showing again? — The screen says it is out of paper, but the tray is still full.

— Em đã thử làm gì rồi? — Em tắt máy rồi bật lại, nhưng vẫn không được.

— What have you tried already? — I turned it off and on again, but it still didn't work.

— Vậy mình gọi bộ phận kỹ thuật, được chứ? — Được, để em gọi ngay.

— Then let's call technical support, okay? — Okay, I'll call now.

The first two turns use gì because the error and attempted action are unknown. The last turn names a proposed action and uses được chứ? to seek acceptance. Once the missing content is supplied, keeping gì would no longer perform the intended conversational task.

Common Mistakes

1. Fronting object gì because English fronts what.

❌ Gì bạn muốn uống?

Incorrect as a neutral question — gì has been moved away from the object position.

✅ Bạn muốn uống gì sau bữa tối?

What would you like to drink after dinner?

2. Translating English do as làm.

❌ Gì làm chị mua ở hiệu sách?

Incorrect — làm is a lexical verb ‘do/make,’ not a question auxiliary.

✅ Chị mua gì ở hiệu sách sáng nay?

What did you buy at the bookstore this morning?

3. Adding a polar particle to an open gì question.

❌ Họ đang thảo luận gì không?

Incorrect for ‘What are they discussing?’; this form instead pulls toward an anything/polar reading.

✅ Họ đang thảo luận vấn đề gì?

What issue are they discussing?

4. Using gì when selecting from a visible set.

❌ Trong ba mẫu này, chị chọn mẫu gì?

Awkward for a selection from three identified models — gì asks more broadly what kind.

✅ Trong ba mẫu này, chị chọn mẫu nào?

Which of these three models are you choosing?

5. Answering a negative question with unanchored yes/no.

⚠ — Em không cần gì nữa à? — Có.

Possible, but an English learner may not know whether có rejects or confirms the negative wording.

✅ — Em không cần gì nữa à? — Có, cho em thêm một chai nước.

— Don't you need anything else? — I do; please give me another bottle of water.

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Use gì for an open “what?” slot, nào for “which one?” from a relevant set, and có...gì...không? when the prior question is whether anything exists or occurred.

Key Takeaways

Leave gì where the thing or content would appear in a statement: mua gì, nhạc gì, để làm gì.
Use cái gì when the unknown thing stands independently, especially as a subject.
Do not front object gì, add English-style do, or append không to a normal open content question.
Particle choices such as à, hả, chứ, and phải không express stance and relationship; they do not all mean generic “question.”
In negative questions, repeat the relevant polarity and content so the answer cannot be misread.

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