Japanese · Pronunciation Guide
ho-shi-i, three beats — the doubled i at the end is one vowel held for two counts.
hoshii
Three morae, unevenly distributed across two written syllables: one beat for ho, two for the long i. Standard speech puts the accent so that the pitch falls partway through, but the duration is what carries the word's identity — a short final i makes it sound truncated and slightly wrong.
Listen: ほしい
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アイスクリームがほしいです。
Aisukuriimu ga hoshii desu.
I want an ice cream.
Listen: アイスクリームがほしいです。
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アイスクリームがほしいです is a loanword feast: アイスクリーム is seven morae (a-i-su-ku-ri-i-mu), with two separate vowels at the start, a devoicing-prone su and ku, a long i, and a final unrounded mu. English "ice cream" is three syllables. Then ほしい adds its own long vowel. The sentence is essentially a lesson in how much longer Japanese renders borrowed words.
English speakers produce "ho-SHEE" in two beats with stress on the second, because the doubled letter looks decorative. It isn't — hold that i until it feels excessive. The h is the other issue: English h is stronger and more turbulent than the Japanese one, which is closer to a shaped breath than to a real fricative.