Chinese · Pronunciation Guide
chweh-DING, both syllables dropping hard. The first contains the rounded front ü, written as u because it follows q.
quèdìng
Two falling tones, unchanged by any rule, with the first compressed and the second fuller. The spelling point deserves as much attention as the tone: after j, q, x and y the letter u always represents ü, so què is not "chway" with a w-glide but a genuinely rounded front vowel.
Listen: 确定
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我很确定。
Wǒ hěn quèdìng.
I'm quite sure.
Listen: 我很确定。
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我很确定。 puts wǒ and hěn together as adjacent third tones, so wǒ rises: wó hěn. Then què and dìng both plunge. The sentence therefore climbs, sinks to the floor, and drops twice from the top — a compact demonstration of how much pitch movement four Mandarin syllables can contain.
The ü is the main failure, with learners producing "chway" using a plain w-glide. Set the tongue for "ee", round the lips without letting the tongue slide back, then open to "eh". Under-aspirating the q gives jué. And the wǒ hěn sandhi at the start is missed constantly, since both words are so routine that beginners stop analysing them.