Japanese · Pronunciation Guide
A single beat, "no" — but a pure Japanese o, with no glide and none of the English word's length.
no
A single mora that leans on whatever precedes it. Particles like this are never given their own emphasis — they ride the pitch contour of the noun in front, so if that noun ends high, the の stays high, and if the noun's accent has dropped, the の stays low. It contributes one beat and no independent melody.
Listen: の
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これは田中さんの本です。
Kore wa Tanaka-san no hon desu.
This is Mr. Tanaka's book.
Listen: これは田中さんの本です。
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これは田中さんの本です shows the particle in its core role, wedged between 田中さん and 本. Say the whole run without a break: Tanaka-san-no-hon. The temptation is to pause before の as English pauses before "of," but Japanese binds it tightly to the preceding word, so the seam should be inaudible.
Because it's spelled like the English word "no," learners import that word wholesale — with its diphthong and its full syllable length. The result is a heavy, drawn-out particle that sticks out of the sentence. Shorten it to a single crisp beat, freeze the lips so the o doesn't glide, and never let it take an accent.