Chinese · Pronunciation Guide
shahng-BAHN, dropping then levelling high. The first syllable ends with a back nasal, the second with a front one — a useful minimal contrast inside a single word.
shàngbān
Drop then plateau, with nothing to adjust. What makes this word pedagogically valuable is the nasal contrast: -ang and -an sit side by side with the same vowel, so if your two syllables rhyme, one of them is wrong. Feel where your tongue ends up on each.
Listen: 上班
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我在办公室上班。
Wǒ zài bàngōngshì shàngbān.
I work in an office.
Listen: 我在办公室上班。
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我在办公室上班。 stacks four falling tones — zài, bàn, shì and shàng — with only the high gōng and the final bān breaking them up. That is a demanding run for an English speaker, because our instinct is to turn repeated falls into one long descent. Each has to restart high. Wǒ at the front keeps its dip since zài is falling.
The nasal merger is the specific danger: learners produce shàng-bāng or shàn-bān, matching the two endings when they should differ. Practise them as a pair, with a hand on your throat to feel where the resonance sits. The b also tends to get aspirated into a pān, and the retroflex sh tends to flatten into an English "sh" — three separate things to keep track of in one short word.