Question Formation in Thai

In Brief

Thai usually makes a yes/no question by keeping the statement intact and adding ไหม at the end: คุณพูดภาษาไทยได้ไหม means “Can you speak Thai?” For information questions, put a question word such as อะไร “what,” ใคร “who,” or ที่ไหน “where” in the place where the missing information would normally appear; unlike English, Thai does not usually move it to the front.

Overview

Question formation is one of the most useful A1 skills in Thai. A short question lets you check a price, find a place, ask someone’s name, or keep a conversation going. The beginner-friendly rule is simple: Thai usually preserves ordinary sentence order. You do not need an English-style auxiliary such as do or does, and Thai verbs do not change form for questions.

Two broad types matter first. A yes/no question asks whether a whole statement is true and can normally be answered positively or negatively. An information question asks for one missing detail with a question word: a person, thing, place, time, reason, or manner.

Thai often leaves out a subject or object when the context makes it obvious. It also uses sentence-final particles to express politeness and attitude. As a result, a natural everyday question may be much shorter than its full English translation.

How It Works

Yes/no questions with ไหม

Start with an ordinary statement and add ไหม at the end of the main content:

Statement	Question	Meaning
คุณชอบกาแฟ	คุณชอบกาแฟไหม	Do you like coffee?
เขาอยู่บ้าน	เขาอยู่บ้านไหม	Is he/she at home?
อาหารเผ็ด	อาหารเผ็ดไหม	Is the food spicy?
คุณพูดภาษาไทยได้	คุณพูดภาษาไทยได้ไหม	Can you speak Thai?

The pattern is:

subject + verb or description + object/complement + ไหม

A complement is information that completes the meaning, such as “at home” or “spicy.” Because Thai adjectives can behave like verbs, แพงไหม directly means “Is it expensive?” There is no separate word corresponding to English is.

If you add a polite sentence ending, it follows ไหม:

• คุณสบายดีไหมครับ — Are you well? (polite; typically said by a male speaker)
• รับกาแฟไหมคะ — Would you like coffee? (polite question; typically said by a female speaker)

In careful standard usage, a female speaker normally uses คะ after a question, not statement-form ค่ะ. In real conversation, pronunciation and particle choices vary with tone, relationship, and personal style.

Questions with หรือ

Sentence-final หรือ can also turn a statement into a question, but it does not always feel identical to neutral ไหม. It commonly asks for confirmation, reacts to new information, or conveys “Is that so?”:

• คุณเป็นครูหรือ — Are you a teacher? / You’re a teacher?
• เขาไม่มาหรือ — Isn’t he/she coming?
• จริงหรือ — Really? / Is that true?

In everyday speech, หรือ is often heard in reduced forms such as เหรอ or หรอ. เหรอ is very common in informal writing and dialogue; หรือ is the safer full form for formal or careful writing.

Do not confuse sentence-final หรือ with หรือ meaning “or” between alternatives:

• เอาชาหรือกาแฟ — Will you have tea or coffee?
• คุณจะไปวันนี้หรือพรุ่งนี้ — Will you go today or tomorrow?

An alternative question asks the listener to choose, so a simple yes or no is usually not the useful answer.

Question words stay in their natural position

English usually places a question word at the beginning: “What are you eating?” Thai generally puts it where the answer would go.

Question word	Basic meaning	Typical position	Example
อะไร	what	object or description slot	คุณกินอะไร
ใคร	who	person slot: subject, object, or owner	ใครมา / คุณคุยกับใคร
ที่ไหน	where	place slot	คุณอยู่ที่ไหน
เมื่อไหร่	when	time slot, often near the end	คุณจะไปเมื่อไหร่
ทำไม	why	often at the beginning, sometimes later	ทำไมคุณไม่ไป
อย่างไร	how	manner slot, often after the verb phrase	ใช้อย่างไร

This “answer-slot” principle is the most important difference from English:

• คุณกินข้าว — You eat rice.
• คุณกินอะไร — What do you eat? / What are you eating?

อะไร replaces ข้าว, so it remains after กิน. Similarly:

• เขาอยู่กรุงเทพฯ — He/she is in Bangkok.
• เขาอยู่ที่ไหน — Where is he/she?

Thai has no equivalent of the English do added just to make these questions. Avoid building a Thai sentence by translating “What do you eat?” one word at a time.

Using the main question words

อะไร — what

Use อะไร for things, actions, names, or definitions:

• นี่คืออะไร — What is this?
• คุณทำอะไร — What are you doing? / What do you do?
• คุณชื่ออะไร — What is your name?

The exact English tense depends on context because the Thai verb itself does not conjugate.

ใคร — who

ใคร can stand where any person would appear:

• ใครอยู่ที่นี่ — Who is here? (subject)
• คุณเห็นใคร — Who did you see? (object)
• นี่ของใคร — Whose is this? (after ของ, “belonging to”)

ที่ไหน and ไหน — where/which

Use ที่ไหน for a location: ห้องน้ำอยู่ที่ไหน “Where is the bathroom?” After motion verbs, ไหน is frequent: คุณจะไปไหน “Where are you going?” The fuller ไปที่ไหน is also possible.

ไหน can also mean “which” when it occurs with a noun or classifier pattern, but those patterns connect with Thai classifiers and are best learned separately.

เมื่อไหร่ — when

เมื่อไหร่ asks for a time:

• คุณมาถึงเมื่อไหร่ — When did you arrive?
• เราจะเจอกันเมื่อไหร่ — When will we meet?

Time markers and context indicate whether the question concerns the past or future.

ทำไม — why

ทำไม often comes first because it frames the reason for the whole event:

• ทำไมคุณเรียนภาษาไทย — Why are you learning Thai?
• ทำไมไม่กิน — Why aren’t you eating?

It can also occur later in conversational Thai, especially when the speaker first establishes a topic: คุณไม่ไปทำไม “Why aren’t you going?” Beginners can safely use the initial pattern.

อย่างไร and ยังไง — how

อย่างไร asks about manner or method and is common in careful or formal language:

• คำนี้อ่านอย่างไร — How is this word read?
• เครื่องนี้ใช้อย่างไร — How do you use this machine?

In everyday conversation, ยังไง is much more common: ไปยังไง “How do I get there?” It may also mean “what should be done?” depending on context.

Short answers

Thai often answers by repeating the relevant verb, adjective, or modal expression rather than using one universal pair equivalent to English yes and no:

Question	Positive answer	Negative answer
ไปไหม — Are you going?	ไป — Yes, I am.	ไม่ไป — No, I’m not.
ชอบไหม — Do you like it?	ชอบ — Yes.	ไม่ชอบ — No.
พูดไทยได้ไหม — Can you speak Thai?	ได้ — Yes, I can.	ไม่ได้ — No, I can’t.
ใช่ไหม — Is that right?	ใช่ — Yes.	ไม่ใช่ — No.

ใช่ and ไม่ใช่ are useful for confirming identity or correctness, but repeating the key word often sounds more direct and natural.

Examples in Context

Thai	English	Note
คุณพูดภาษาไทยได้ไหม	Can you speak Thai?	Neutral yes/no question with ไหม
วันนี้ร้านเปิดไหม	Is the shop open today?	The statement order is unchanged
คุณอยู่ที่ไหน	Where are you?	ที่ไหน fills the location slot
ห้องน้ำอยู่ที่ไหนครับ	Where is the bathroom?	Polite question from a male speaker
นี่คืออะไร	What is this?	อะไร follows คือ
คุณกำลังทำอะไร	What are you doing?	อะไร is the object of ทำ
ใครโทรมา	Who called?	ใคร is the subject
คุณไปกับใคร	Who are you going with?	ใคร follows กับ “with”
คุณจะไปเมื่อไหร่	When will you go?	จะ marks future intention
ทำไมวันนี้ไม่ทำงาน	Why aren’t you working today?	ทำไม frames the reason question
ไปสถานียังไงคะ	How do I get to the station?	Conversational ยังไง; polite female question
คำนี้อ่านอย่างไร	How is this word read?	Careful or formal อย่างไร
คุณอยากกินอะไร	What do you want to eat?	Question word remains after the verb chain
เอาชาหรือกาแฟ	Would you like tea or coffee?	Choice question with หรือ
จริงเหรอ	Really?	Informal reaction or confirmation

Common Mistakes

Moving every question word to the front

• Unnatural for the intended neutral meaning: อะไรคุณกิน
• Natural: คุณกินอะไร
• Why: In a basic information question, อะไร stays where the answer would appear: คุณกินข้าว → คุณกินอะไร. Fronting can create special emphasis or a marked conversational effect, so it is not the default beginner pattern.

Adding ไหม to an information question

• Wrong for “Where are you?”: คุณอยู่ที่ไหนไหม
• Right: คุณอยู่ที่ไหน
• Why: ที่ไหน already makes the sentence a question. ไหม asks whether a statement is true; the two question types are not normally stacked this way.

Translating English “do” or “is” literally

• Wrong: adding ทำ because English says “What do you eat?”
• Right: คุณกินอะไร
• Why: English do is only a grammatical helper here. Thai needs the actual verb กิน “eat,” not ทำ “do.” Likewise, adjective questions such as แพงไหม need no separate “is.”

Putting a polite particle before ไหม

• Wrong: คุณสบายดีครับไหม
• Right: คุณสบายดีไหมครับ
• Why: ไหม closes the question content, and the polite particle normally follows it.

Treating ใช่ as the answer to every question

• Less natural: ไปไหม — ใช่
• Natural: ไปไหม — ไป / ไม่ไป
• Why: Thai commonly echoes the relevant verb or description. Use ใช่/ไม่ใช่ when confirming that something is or is not the case, especially with ใช่ไหม.

Assuming หรือ is always interchangeable with ไหม

• Potentially mismatched: คุณชอบกาแฟหรือ when you simply want a neutral preference question
• Neutral: คุณชอบกาแฟไหม
• Why: Final หรือ/เหรอ often sounds like confirmation, reaction, or mild surprise. ไหม is the safer neutral choice for a straightforward yes/no question.

Usage Notes

Thai questions do not require a written question mark, although ? is common in modern informal and learner-facing writing. In ordinary Thai prose, sentence structure and question words can make the function clear without it.

Subjects and objects are frequently omitted when understood. At a café, เอาไหมคะ can mean “Would you like it?” and รับอะไรครับ can mean “What would you like?” The missing noun or pronoun is recovered from the situation. English learners sometimes overuse คุณ because English normally requires an explicit “you”; in Thai, repeating it can sound stiff when the listener is already obvious.

Politeness does not come from question grammar alone. ครับ, คะ, wording, voice, and the social relationship all matter. A bare ไปไหน can be a friendly “Where are you going?” among people who know each other, but adding ครับ/คะ is useful in polite interactions.

Beyond the Basics / Advanced Use

You do not need to master the following patterns at A1, but you will hear them often.

Confirmation with ใช่ไหม and tag-like endings

ใช่ไหม asks the listener to confirm an assumption:

• คุณมาจากอังกฤษใช่ไหม — You’re from England, right?
• พรุ่งนี้หยุดใช่ไหม — Tomorrow is a holiday, isn’t it?

In rapid speech it may be reduced, and other final particles can express different shades of expectation, surprise, insistence, or friendliness. These particles are not simple one-to-one equivalents of English question tags.

The positive–negative pattern

Thai can form a question by pairing a word with its negation:

• ไปไม่ไป — Are you going or not?
• ชอบไม่ชอบ — Do you like it or not?
• ได้ไม่ได้ — Can it be done or not?

This pattern asks for a definite choice and may sound more insistent than a neutral ไหม question, depending on tone and context.

More question expressions

Several very frequent question forms build on the same answer-slot principle:

Form	Meaning	Example
กี่	how many; used with counting patterns	มีกี่คน — How many people are there?
เท่าไหร่	how much/how many	ราคาเท่าไหร่ — How much is it?
กี่โมง	what time	ตอนนี้กี่โมง — What time is it now?
อันไหน	which one	คุณชอบอันไหน — Which one do you like?
แบบไหน	what kind	อยากได้แบบไหน — What kind do you want?

Forms with กี่ and อันไหน interact with classifiers (counting words used with nouns), so their full word order becomes easier after studying basic classifiers.

Question words in embedded questions

A question word can also appear inside a larger statement:

• ผมไม่รู้ว่าเขาอยู่ที่ไหน — I don’t know where he/she is.
• บอกหน่อยว่าต้องทำอย่างไร — Please tell me how it should be done.

Thai still keeps the question word in its normal answer slot. There is no English-style inversion inside the embedded question either.

Practice Tips

1. Turn statements into two kinds of questions. Start with คุณกินข้าว. Make คุณกินข้าวไหม, then replace the object: คุณกินอะไร. This trains the difference between adding ไหม and filling an answer slot.
2. Answer by echoing the key word. Drill pairs such as ไปไหม — ไป/ไม่ไป, ชอบไหม — ชอบ/ไม่ชอบ, and ได้ไหม — ได้/ไม่ได้ instead of relying on ใช่ for every “yes.”
3. Listen for the ending. In short Thai clips or conversations, note whether speakers use ไหม, full หรือ, conversational เหรอ, or ใช่ไหม. Copy the whole question aloud with its polite particle and intonation.

Related Concepts

• Prerequisite: Basic Verb Structure — provides the statement word order that Thai questions usually preserve.
• Useful companion: Politeness Particles — explains ครับ, ค่ะ, and คะ in polite interaction.
• Useful companion: Negation — helps with negative questions and answers such as ไม่ไป and ไม่ได้.
• Next step: Classifiers (Basic) — needed for common questions with กี่ and “which one” patterns.
• Next step: Numbers and Time — expands practical questions such as กี่โมง and เท่าไหร่.