LingoDrop
Chinese · Pronunciation Guide
How do you pronounce "快" in Chinese?
kwai with a strong puff of air, dropping hard. Aspirated k, rounded glide, then the wide diphthong of "eye".
kuài
The fall is fixed, and it flips the negator: 不快 becomes bú kuài. Pairing this with 坏 huài is instructive — same final, same tone, different initial, and the aspirated k versus the scraped h is the only thing separating fast from broken.
Listen: 快
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Sound it out
Hear it in a sentence
这辆车很快。
Zhè liàng chē hěn kuài.
The car is very fast.
Listen: 这辆车很快。
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这辆车很快。 keeps hěn at a full dip before kuài, because kuài falls rather than dips. So the sentence gives a fall, a fall, a level, a dip, and a final plunge. Hěn sitting at the floor immediately before the leap up to kuài is the sharpest interval in it, and flattening that leap is the usual failure.
Where English speakers slip
Under-aspirating gives guài, a different word. The bigger issue is the triple glide, which learners routinely shorten to "kwai" without the open middle — the "ah" should be the longest component, and skipping it robs the fourth tone of the space it needs to descend. Say it slowly and feel the mouth pass through all three positions.