Chinese · Pronunciation Guide
chee with an audible puff of air, held high and flat. The initial is made further forward than any English ch, with the lips spread wide.
qī
Held high, and no rule in the language will move it. The syllable's real role in the tone system is as a target: because it is high and level, 一 in front of it converts to a fourth tone, so a phrase like yī qī is never actually spoken that way.
Listen: 七
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一个星期有七天。
Yí ge xīngqī yǒu qī tiān.
A week has seven days.
Listen: 一个星期有七天。
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一个星期有七天。 contains two separate 一-related points even though only one 一 appears. The number one at the start becomes yí because 个 is underlyingly fourth tone. Then xīngqī gives you two high level syllables in a row, which flows straight into yǒu, a dip, and back up to qī, high again. Hearing where those level plateaus start and stop is the exercise here.
The commonest fault is under-aspirating, so that qī comes out as jī — the sound in 鸡 and 机, which will genuinely confuse a listener. Hold a hand in front of your mouth; you should feel the air. Learners also frequently pronounce the initial like the English ch of "church", with rounded lips and the tongue too far back; spread the lips instead.