Dutch · Pronunciation Guide
OP-stahn — stress on the prefix, plain s in "st" (never "sht"), and a long open "aah."
Separable verbs put the primary beat on the prefix, so it is OP-staan and never op-STAAN. That rule is completely reliable and it doubles as a diagnostic: if the prefix is stressed, the verb will split apart in a main clause.
Listen: opstaan
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Ik sta om zeven uur op.
I get up at seven.
Listen: Ik sta om zeven uur op.
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"Ik sta om zeven uur op" demonstrates the split exactly — "sta" takes second position and "op" is exiled to the end of the clause. The stem also loses the second a in spelling because the syllable is now open, which is the mirror image of what happened in the infinitive.
Beginners keep the verb together, producing "ik opsta om zeven uur," which is ungrammatical in a main clause. Phonetically the risk is the st-: German speakers and English speakers who have studied German say "OP-shtahn." Dutch does not palatalise that s anywhere. Watch the vowel length too — the aa should be noticeably long.