Yes and no in Thai are trickier than a phrasebook admits. The words chai (ใช่) for "yes" and mai chai (ไม่ใช่) for "no" do exist — but Thai usually answers a question by echoing its verb instead. Ask "want it?" and the natural yes is simply ao (เอา), "want."
So chai is real, but it means something closer to "that's right" than a blanket "yes." Once the echo trick clicks, Thai answers stop feeling backwards and start making sense.
Chai and mai chai
Use chai (ใช่) to confirm that something is correct — a fact, a name, an identity. Its opposite, mai chai (ไม่ใช่), means "that's not it."
ใช่
chai
Yes / that's right
ไม่ใช่
mai chai
No / that's not it
"You're American, right?" — chai. But for most everyday questions, Thai reaches for a different pattern entirely.
The real trick: echo the verb
Thai has no all-purpose "yes." To agree, you repeat the verb from the question; to refuse, you put mai (ไม่), "not," in front of it. Ask ao mai? ("want it?") and the answers are:
เอา
ao
Yes (I'll take it / I want it)
ไม่เอา
mai ao
No (I don't want it)
The same move works everywhere. Pai mai? ("going?") becomes pai for yes or mai pai for no. Learn the verb and you already know how to say yes and no to it.
Can and can't: dai and mai dai
One echo pair is worth memorizing on its own, because it answers a hundred questions: dai (ได้), "can / that works," and mai dai (ไม่ได้), "can't / not allowed."
ได้
dai
Yes, I can / that works
ไม่ได้
mai dai
No, I can't / that's not allowed
The polite yes: krub and ka
Often the softest "yes" is just your politeness particle on its own. A man answering krub (ครับ) or a woman answering ka (ค่ะ) lands somewhere between "yes," "mm-hm," and "understood" — friendly and completely natural.
Asking yes-or-no questions
To turn a statement into a yes-or-no question, add the particle mai (ไหม) to the end: ao mai? ("want it?"), pai mai? ("going?"). It is the little hook that invites a yes or no.
This question word mai (ไหม) is not the same as the negative mai (ไม่), "not." They are different words with different tones — the question particle rides a high tone, while the "not" falls sharply. Same roman spelling, opposite jobs: one opens a question, the other cancels a verb. Our Thai sentence structure guide shows where each one sits.
Saying no politely
A bare "no" can feel blunt, so Thais cushion it. To turn something down kindly, try mai ao khop khun ("no thank you") or the ever-useful mai pen rai (ไม่เป็นไร), which here means "it's fine, I'm okay." You can also soften a flat correction by adding your particle — mai chai krub or mai chai ka — which takes the sting out of telling someone they are wrong. A smile does the rest.
Keep learning Thai
Once you stop hunting for a single word for "yes" and start echoing the verb, Thai answers fall into place fast. Drill the core pairs — chai and mai chai, ao and mai ao, dai and mai dai — with audio and speaking practice in the Pretalk app, and keep going with the free essential Thai phrases so real conversations stop catching you off guard.
