German · Pronunciation Guide
IST, with the vowel of sit and a plain st. It is not 'isht', because the sh rule applies only when st begins a word.
The verb sits in second position, where German grammar demands it, but rhythmically it is usually a stepping stone rather than a destination — the beat lands on whatever new information follows. Only in an argument about the facts, Es IST so, does the copula grab the stress for itself.
Listen: ist
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Sie ist meine Schwester.
She is my sister.
Listen: Sie ist meine Schwester.
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Sie ist meine Schwester puts the verb second and the predicate noun after it, and Schwester is a small pronunciation lesson in itself: sch is sh, w is v, and its internal st sits at a syllable boundary rather than a word start, so it stays a plain st. The word comes out 'SHVES-tuh'.
Once learners meet Stuhl and Straße and learn that st is 'sht', they over-apply it and start saying 'isht'. The rule is positional: word-initial st and sp become 'sht' and 'shp', and everywhere else they stay as written. Mispronouncing this particular word is especially conspicuous because it appears in almost every sentence a beginner produces.