Spanish · Pronunciation Guide
deh, with the vowel of "bed" and a d made against the teeth — not "dee" or "duh".
One unstressed syllable. "De" is a preposition and never takes the beat, so in "la casa de Ana" the weight sits on CA and A-na while "de" slips between them almost unnoticed. Length, not just volume, is what marks it as unstressed.
Listen: de
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Es la casa de Ana.
It's Ana's house.
Listen: Es la casa de Ana.
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"Es la casa de Ana" uses "de" for possession — Spanish has no apostrophe-s construction, so ownership is always expressed backwards as the house of Ana. Listen to "casa de": the d sits between two vowels and softens right down toward a th, so the phrase runs KA-sa-the-A-na in one flow.
Two habits, pulling in opposite directions. Readers who trust English spelling say "dee", borrowing the letter name; readers who know it is unstressed swing too far and say "duh", importing the English schwa. Spanish sits between them with a clean short "eh" that stays clear even when quiet. And the d itself needs to move forward onto the teeth — an English d made on the ridge behind them sounds heavy in a word this small.