Spanish · Pronunciation Guide
por KEH, two words — the u is silent and the stress falls on the second word.
Two separate words with one peak, on QUÉ. The accent marks it as a question word, just as it does in "qué" alone. Compare the one-word "porque" (because), which has no accent and is stressed POR-que — so the pair differs in spacing, accent and rhythm all at once, even though the letters are identical.
Listen: por qué
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¿Por qué llegaste tarde?
Why did you arrive late?
Listen: ¿Por qué llegaste tarde?
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"¿Por qué llegaste tarde?" uses the two-word question form. The answer would use the one-word "porque", which is the whole reason the distinction matters. "Llegaste" opens with the double l as a y sound and is stressed lle-GAS-te, second-to-last, with no accent needed.
Pronouncing the u gives "por KWEH", the reflex from English "quest". It is silent after q. The written form is where the real damage happens: "por qué" asks a question, "porque" gives a reason, and "por que" and "porqué" are two further variants with narrower uses. Learn the first two properly and the others rarely come up.