Chinese · Pronunciation Guide
hwai, dropping hard from high to low. A scraped h, immediate lip-rounding, then the diphthong of "eye".
huài
Unmoved itself, but it forces a change to its left: 不坏 becomes bú huài. It sits close to 快 kuài and 怀 huái, which differ by initial and by tone, so both the friction on the h and the direction of the pitch are carrying information here.
Listen: 坏
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这个苹果坏了。
Zhège píngguǒ huài le.
This apple has gone bad.
Listen: 这个苹果坏了。
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这个苹果坏了。 places huài before the toneless le, so the fall is followed by a weightless tail at the low pitch — the sentence expires rather than stopping. Before that, zhè falls, ge is toneless, píng rises and guǒ dips. Notice that guǒ and huài are not both third tones, so no sandhi occurs between them.
The h disappears for most learners, leaving "why", because English "h" is weak before a rounded glide and often deleted altogether. Put friction at the back of the mouth so the consonant survives. Learners also shorten the triple glide, collapsing it to "hwai" without the open middle, which thins the syllable and shortens the tone.