Chinese · Pronunciation Guide
dway, dropping hard. Unaspirated d, immediate lip-rounding, then a glide with a hidden middle vowel.
duì
Nothing alters the fall, and 对 is one of the most common triggers for the 不 rule in the language: bú duì, meaning "not right", is a phrase you will hear constantly, and it is always the rising form. Getting that automatic is worth more than memorising the rule abstractly.
Listen: 对
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你说得对。
Nǐ shuō de duì.
You are right.
Listen: 你说得对。
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你说得对。 keeps nǐ at a full dip because shuō is level. Then de goes toneless and duì drops hard at the end. The sentence therefore descends, plateaus, empties out, and plunges — and the toneless de is essential, because giving it a full tone turns a natural compliment into a stilted recitation.
Learners collapse the vowel to "dwee", losing the middle "eh", or split it into "doo-ay" with two beats. It is one beat with three vowel positions. Aspirating the d gives tuì, a different word. And the tone tends to soften when the word is used as agreement, because English says "right" with a gentle fall — Mandarin wants the full plunge.