Confirmation Questions with ใช่ไหม

ใช่ไหม asks the listener to confirm a proposition that the speaker considers likely, remembered, inferred, or just heard. คุณเป็นคนจองโต๊ะใช่ไหมคะ means “You are the person who reserved the table, right?” The speaker presents “you reserved it” and asks whether that understanding is correct.

This differs from neutral ไหม. Both appear after an unchanged Thai proposition, but ใช่ไหม carries a prior leaning toward that proposition. English spreads similar meanings across right?, isn't it?, didn't you?, and many other tags. Thai does not copy the English auxiliary or change ใช่ไหม for tense or subject.

Present a proposition, then request confirmation

Place ใช่ไหม after the full proposition and before polite ครับ/คะ. The proposition may describe identity, an action, a property, a time, or a completed event.

The verb เลื่อน does not become a past form. The context says that a change was announced, and ใช่ไหม checks the remembered new time. With a future plan, the same fixed ending appears: พรุ่งนี้เจอกันบ่ายสองใช่ไหมครับ “We're meeting at two tomorrow, right?”

The contrast with ไหม and หรือเปล่า

The three endings can question the same basic proposition while organizing the conversation differently.

Neither question is more polite merely because it is longer. The first lacks a grammatical commitment to either answer. The second signals that “open until nine” is already in the speaker's working understanding.

ใช่ไหม is standard neutral spelling. ใช่มั้ย is common in (informal) messages and quoted casual dialogue. More reduced spellings such as ใช่มะ are strongly (informal) and socially marked; recognize them, but do not use them as the default written form.

Positive, negative, and corrective answers

Because the construction explicitly asks whether the proposed understanding is ใช่ “correct,” ใช่ครับ/ค่ะ and ไม่ใช่ครับ/ค่ะ are natural whole-proposition answers. A speaker can also repeat the focused information or give a replacement.

The answer ใช่ confirms the entire negative proposition คุณไม่กินหมู. It does not mean that the embedded action “eat pork” is positive. This is one reason English speakers can become confused by negative confirmation questions: Thai ใช่ validates what was proposed, whether that proposal contains ไม่ or not.

Here ยัง rejects the claimed completion more helpfully than a bare ไม่ใช่. Answer choice follows what needs correction, not an English requirement to begin every answer with yes or no.

Negation belongs inside the proposition

The location of ไม่ changes which proposition receives confirmation. Compare ไม่ได้ส่ง “did not send” with ส่งไม่ได้ “cannot send.”

English may use didn't in the first and can't in the second. Thai does not rearrange either auxiliary to form the question. It builds the intended positive or negative proposition and places fixed ใช่ไหม after it. The negative identity page explains lexical ไม่ใช่ when the proposition itself rejects an identity.

Confirmation and hearing repair

The prior belief may come from memory, visual evidence, or the immediately preceding words. In a noisy place, repeating the uncertain piece with ใช่ไหม asks the other person to repair or confirm it.

The subject of บอก is omitted because the current speaker is checking the addressee's words. Thai does not require an overt you, and ใช่ไหม does not supply one.

The proposition itself may be reduced when its topic is visible or was just mentioned. At a hotel desk, สองคืนใช่ไหมคะ asks “Two nights, right?” after the reservation is already active. This is not a separate fragment grammar: สองคืน is the focused value left overt, while the reservation and guest are recoverable.

An English speaker may feel obliged to reconstruct “You are staying for three nights.” Thai can correct only the disputed value because the rest is already shared. If the reservation is not active in the discourse, restore a fuller proposition: คุณจองไว้สามคืนใช่ไหมคะ.

Ordinary-polite dialogue

Two colleagues confirm travel details.

The final reply corrects the necessity itself with ไม่ต้อง, which is clearer than merely saying ไม่ใช่.

Common Mistakes

1. Putting ใช่ไหม at the front

2. Using a confirmation frame for a completely open choice

3. Misplacing negation and changing the proposition

4. Using female statement ค่ะ after a question

Key Takeaways

Use ใช่ไหม after a complete proposition when you want validation of an expectation, memory, or inference. Keep time, aspect, modality, and negation inside that proposition; put ครับ/คะ after the confirmation frame; and correct the specific disputed information rather than mechanically translating English yes or no.