Japanese · Pronunciation Guide
i-shi, two beats — two high front vowels, the second of which usually whispers.
ishi
Two units of identical duration. Both morae contain the same vowel, so the hiss between them is what marks the boundary — and since the second vowel often disappears, the word's rhythm has to be counted rather than heard.
Listen: 石
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川の近くで石を見つけました。
Kawa no chikaku de ishi o mitsukemashita.
I found a stone near the river.
Listen: 川の近くで石を見つけました。
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川の近くで石を見つけました contains 見つけました, six morae with an affricate in the middle, and 近く with a devoicing-prone ku. So the sentence has whispered vowels in three separate words, all of which still occupy their beats.
"EE-shee" doubles both vowels and stresses the first. Halve them, let the second devoice, and keep both beats equal. Learners also push too much air through the sh — Japanese uses noticeably less, and the sound sits further forward in the mouth.