Dutch · Pronunciation Guide
SLOW-tuh — but the ui is a rounded diphthong with no English equivalent, not the "ow" of "cow."
First-syllable stress, and that syllable is dominated by the diphthong, which takes time to travel from its rounded start to its glide. Give it that time; rushing it is what turns the ui into a flat English vowel.
Listen: sluiten
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Wilt u het raam sluiten?
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Listen: Wilt u het raam sluiten?
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Wilt u het raam sluiten?" is a formal request using "u" and the matching verb form "wilt." The infinitive lands at the end, and just before it "raam" gives you a long open "aah" — a useful contrast with the rounded diphthong that follows immediately after.
The letters "ui" invite the "ow" of "out," which starts wide open and unrounded. Dutch begins with pursed lips and the tongue forward. Others guess "oo-ee" from the spelling, which is equally wrong. The fix is mechanical: round the lips first, then move — do not open the mouth wide at any point.