Dutch · Pronunciation Guide
ZAY-kur — barely-voiced z, long "ay" under the stress, and a weak second syllable.
Weight at the front, with the second syllable reduced to almost nothing. The pattern repeats across a large family of Dutch words ending in -er — lekker, water, beter — where the ending is always weightless and the r nearly inaudible.
Listen: zeker
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Ik ben er zeker van.
I'm sure about it.
Listen: Ik ben er zeker van.
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"Ik ben er zeker van" uses the pronominal adverb "er ... van," splitting the preposition away from its object. That construction has no English parallel — you cannot say "ik ben zeker van het" — and it is one of the genuinely hard corners of Dutch grammar.
The -er ending gets a full American r, turning "ZAY-kur" into something with the r dominating the syllable. Dutch keeps it faint. Learners also over-buzz the initial z and shorten the long vowel. Grammatically, forgetting the "er" in the fixed phrase is the more consequential error.