Spanish · Pronunciation Guide
LEEM-pyoh, two beats — the io glides into one sound, so it is not "lim-pee-oh".
LIM-pio: two syllables, and the first carries the beat because the io counts as a single diphthong and the word ends in a vowel. All four forms keep the same placement, and the verb "limpiar" moves the beat to the end — lim-PIAR — because it finishes in r, while keeping the same one-beat glide.
Listen: limpio
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El cuarto está limpio.
The room is clean.
Listen: El cuarto está limpio.
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"El cuarto está limpio" uses estar, since cleanliness is a state that changes. "Cuarto" packs its ua into one glide, KWAR-to, and contains a single tapped r. Both words in the pair "cuarto limpio" end in the same pure "oh", which English would want to reduce.
Stretch the io into two syllables and you get "LIM-pee-oh" instead of a single glide. Then the stressed i gets slackened into the "ih" of English "limp", when Spanish wants a tight "ee". The p also wants an English puff of air. And a usage note: "limpio" describes the state, while "limpiar" is the action — do not use the adjective where a verb belongs.