Chinese · Pronunciation Guide
shay, rising from mid to high, with the tongue curled back. There is a second accepted pronunciation, shuí, which you will also hear.
shéi
Rising and stable. The genuinely useful fact is that this character has two standard readings — shéi and shuí — with the same meaning and the same tone. Both are correct; shéi is more colloquial and shuí more formal or northern. It is one of the few places where Mandarin tolerates open variation.
Listen: 谁
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那个人是谁?
Nàge rén shì shéi?
Who is that person?
Listen: 那个人是谁?
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那个人是谁? ends on shéi, so the rise completes with nothing after it. Before that, nà falls, ge goes toneless, rén climbs, and shì falls. The question therefore alternates fall and rise throughout and finishes by climbing — but again, that is the word's own tone, not an interrogative melody.
English "sh" with a flat tongue is the standard substitution, which pushes the syllable toward the thin x sound. Curl the tip back. The rise is the other issue: because question words in English often carry falling intonation, learners let the pitch drop, and a falling shèi is not a word — the result simply sounds unclear rather than wrong, which makes it hard to self-correct.