Spanish · Pronunciation Guide
lah PWEHR-tah, two beats in the noun — the ue glides into a single sound.
PUER-ta: two syllables, and the first carries the beat because the ue counts as one diphthong and the word ends in a vowel. The plural "puertas" keeps it. Note that the related "portal" and "portero" drop the ue back to a plain o, since the diphthong only surfaces under stress.
Listen: la puerta
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Esa puerta está abierta.
That door is open.
Listen: Esa puerta está abierta.
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"Esa puerta está abierta" uses estar for a temporary state and makes the participle feminine to agree. "Abierta" also contains an ie diphthong in one beat, so the sentence has two words with glides — PWEHR-ta and a-BYEHR-ta — both of which English wants to split apart.
Break the ue into two beats and you get "poo-EHR-ta", but the u is a glide belonging to the first syllable. Then the r bends the vowel backward English-style, producing "PWAIR-ta". Keep the "eh" clean and flick the tongue once. The p also wants an English puff, and the final a wants reducing.