Japanese · Pronunciation Guide
a-o — two separate vowel beats, not the single diphthong of English "ow."
ao
Two morae made of nothing but vowels, which is where English intuitions fail hardest: English fuses adjacent vowels into diphthongs automatically, so "ao" is heard as one syllable and given one beat. Japanese counts two. Say them as two deliberate pulses until the two-count is stable, then let it smooth out without losing the length.
Listen: 青
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空は青いです。
Sora wa aoi desu.
The sky is blue.
Listen: 空は青いです。
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空は青いです adds a third vowel to make 青い (a-o-i) — three vowels in a row, three separate beats, no consonants at all. It's an extreme case of the same principle, and it's genuinely hard at speed. 空 at the start is also two morae (so-ra) with a flapped r, so the sentence balances a vowel cluster against a consonant one.
Nearly every English speaker produces "ow" or "ah-oh" with a glide between the vowels. Japanese has no glide there: the vowels simply follow one another, each with its own full duration. The second failure is shortening — treating a-o as one syllable's worth of time. Give the word two honest counts and keep both vowels pure from beginning to end.