Chinese · Pronunciation Guide
chü, dropping hard — an aspirated palatal initial plus the rounded front vowel. The u after q is always ü, never plain "oo".
qù
Its own drop is fixed, but it sets off changes constantly because it turns up in so many verb phrases. 不去 becomes bú qù; 一 before it becomes yí. In wǒ qù, the pronoun keeps its full dip since qù falls rather than dips.
Listen: 去
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我们去公园吧。
Wǒmen qù gōngyuán ba.
Let's go to the park.
Listen: 我们去公园吧。
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我们去公园吧。 puts qù between the toneless men and the high gōng, so it stands out as the one sharp drop in the first half. The sentence then ends with the toneless ba trailing off after yuán, which rises. So the suggestion finishes high and light rather than with any downward finality — the particle does not resolve the pitch.
The overwhelming error is "choo", with a plain rounded "oo" instead of ü. That vowel does not exist in this syllable, and using it produces something closer to chū. The remedy is mechanical: say "chee", freeze the tongue, then purse the lips. Under-aspirating is the secondary problem, since a soft release makes qù sound like jù.