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Jyutping deoi3 bat1 deoi3
Pinyin duì bu duì ( toneless variant )

Definitions (Wiktionary)
  1. phrase
    used as a tag question: isn't it so?, right or wrong?, is it right?, OK, yes? (colloquial)
  2. phrase
    Used other than figuratively or idiomatically: see 對/对 (duì), 不, 對/对 (duì).

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Jyutping deoi3 bat1 deoi3
Pinyin duì bù duì

Definitions (CC-CEDICT)
  1. right or wrong?
  2. Is it right?
  3. OK, yes? (colloquial)
Definitions (Wiktionary)
  1. phrase
    used as a tag question: isn't it so?, right or wrong?, is it right?, OK, yes? (colloquial)
  2. phrase
    Used other than figuratively or idiomatically: see 對/对 (duì), 不, 對/对 (duì).
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我的答案对不对?
    我的答案對不對?
    wǒ de dá àn duì bù duì ?
    • Is my answer correct?
  2. Mandarin
    我在想我写的对不对。
    我在想我寫的對不對。
    wǒ zài xiǎng wǒ xiě de duì bù duì 。
    • I wonder if what I wrote was correct.
  3. Mandarin
    你喜欢古典音乐, 对不对?
    你喜歡古典音樂, 對不對?
    nǐ xǐ huan gǔ diǎn yīn yuè , duì bù duì ?
    • You like classical music, don't you?
  4. Mandarin
    这个房间超赞的,对不对?
    這個房間超讚的,對不對?
    zhè ge fáng jiān chāo zàn de , duì bù duì ?
    • This room's pretty awesome, eh?
  5. Mandarin
    你以前在那儿,对不对?
    你以前在那兒,對不對?
    nǐ yǐ qián zài na er , duì bù duì ?
    • You were there once, weren't you?