Japanese · Pronunciation Guide
i-su, two beats — the second vowel usually devoices, so the word ends on a hiss.
isu
Two slots, both short, with the crest on the first. Because the second beat is often nothing but friction, English speakers hear one syllable and give one beat — but the timing slot is still there, which is why the word sounds truncated when rushed.
Listen: いす
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このいすに座ってください。
Kono isu ni suwatte kudasai.
Please sit on this chair.
Listen: このいすに座ってください。
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このいすに座ってください contains 座って with its geminate: su-wa-t-te, four morae including a beat of held silence. So a word whose second beat is nearly inaudible is followed by one with a beat of actual silence — two different kinds of "nothing" that both take time.
"EE-soo" stretches the first vowel, stresses it, and rounds the second. Halve the i, spread the lips, and let the u devoice. Learners who voice it fully also tend to add length, making a very short two-beat word sound like a substantial three-syllable one.