Farsi · Pronunciation Guide
Say "roo-yeh": a long "oo" like in "boot," then a light "yeh" tacked on the end — the whole thing is smoother and faster than it looks written out.
ru-ye
Stress falls on the first syllable "RU"; the trailing "-ye" is an unstressed ezafe glide, said quickly and softly, almost like an afterthought.
Listen: روی
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کتاب روی میز است.
Ketāb ru-ye miz ast.
The book is on the table.
Listen: کتاب روی میز است.
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"Ketāb ru-ye miz ast" (کتاب روی میز است) shows ru-ye already carrying its ezafe ("-ye") baked into the spelling, because the bare root "ru" ends in a vowel and Persian writes the ezafe as ی after vowel-final words. So you never say a bare "ru" here — it's always "ru-ye X."
Because the ezafe is spelled with a full letter (ی) here rather than left invisible, learners sometimes read it as a strong, separate syllable "yeh" with its own stress, when it should be a light, quick glide fused onto "ru" — think "ROO-yeh," not "ROO... YEH."