Question Formation in Vietnamese

Overview

Vietnamese forms questions without changing word order or verb forms. Yes/no questions are created by adding particles like "không" or "chưa" at the end of a statement, or by using the "có...không" frame. Information questions (wh-questions) place the question word where the answer would go in the response, similar to Chinese but unlike English.

At the CEFR A1 level, mastering these two question types enables basic conversation. The system is remarkably regular: once you know the statement form, you can form the corresponding question by adding a particle or inserting a question word.

Vietnamese question words include "gì" (what), "ai" (who), "đâu" (where), "khi nào" (when), "tại sao/sao" (why), and "thế nào/sao" (how). These words stay in their natural position within the sentence rather than moving to the front as in English.

How It Works

Yes/No questions:

Pattern	Example	Meaning
Statement + không?	Bạn đi không?	Are you going?
Có + Verb + không?	Bạn có đi không?	Are you going? (fuller form)
Statement + chưa?	Bạn ăn chưa?	Have you eaten yet?
Statement + phải không?	Bạn là giáo viên, phải không?	You are a teacher, right?

Information questions (question word in situ):

Question Word	Example	Meaning
gì (what)	Đây là cái gì?	What is this?
ai (who)	Ai đến?	Who is coming?
đâu (where)	Bạn ở đâu?	Where are you?
khi nào (when)	Khi nào đi?	When are you going?
tại sao (why)	Tại sao không đi?	Why don't you go?
thế nào (how)	Thế nào?	How? / How is it?
mấy/bao nhiêu (how many)	Mấy giờ?	What time?

Examples in Context

Vietnamese	English	Note
Bạn nói tiếng Việt được không?	Can you speak Vietnamese?	được không = can...?
Bạn ở đâu?	Where are you?	đâu stays where answer goes
Đây là cái gì?	What is this?	gì in object position
Tại sao?	Why?	standalone question word
Ai nói?	Who said that?	ai in subject position
Bạn đi khi nào?	When are you going?	khi nào at end
Bao nhiêu tiền?	How much money?	quantity question
Thế nào rồi?	How is it going?	how + already
Có thích không?	Do you like it?	có...không pattern
Bạn tên gì?	What is your name?	gì replaces the answer
Ăn chưa?	Have you eaten yet?	chưa = yet (greeting)
Đi đâu vậy?	Where are you going?	vậy = sentence softener

Common Mistakes

Moving Question Words to the Front

• Wrong: Đâu bạn ở? (copying English "Where do you live?")
• Right: Bạn ở đâu?
• Why: Vietnamese question words stay in the position where the answer would appear. "Bạn ở Hà Nội" answers "Bạn ở đâu?"

Adding Question Intonation Instead of Particles

• Wrong: Relying solely on rising intonation to mark a yes/no question
• Right: Add "không," "chưa," or use "có...không" pattern
• Why: Vietnamese uses particles, not intonation, for yes/no questions. Rising intonation can distort tones.

Confusing Không and Chưa in Questions

• Wrong: Bạn ăn không? (when asking if they have eaten yet)
• Right: Bạn ăn chưa?
• Why: "Không" asks about general yes/no; "chưa" specifically asks about whether something has happened yet.

Usage Notes

"Ăn chưa?" (Have you eaten yet?) is one of the most common Vietnamese greetings, equivalent to "How are you?" It does not always require a literal answer about food. "Phải không?" at the end of a sentence functions like English tag questions ("right?" or "isn't it?").

In Southern speech, "hả" and "hông" are common casual question particles. Northern speakers use "à" and "nhỉ" more frequently as question softeners.

Practice Tips

• Practice converting statements to questions by adding "không?" to the end. Every declarative sentence can become a question this way: "Bạn thích" (You like) becomes "Bạn thích không?" (Do you like it?).
• For wh-questions, first say the answer sentence, then replace the answer word with the question word. "Bạn ở Hà Nội" becomes "Bạn ở đâu?" This in-situ strategy makes Vietnamese questions intuitive.

Related Concepts

• Prerequisite: Basic Verb Structure — questions are built on statement structures
• Next steps: Sentence-Final Particles (Intermediate) — particles that soften or modify questions
• Next steps: Modal Particles — advanced particles for nuanced questions