Chinese · Pronunciation Guide
bahn, dropping hard, with no puff of air. A broad open vowel and a front n.
bàn
This drop never changes and it triggers the negator's switch to bú. In telling the time this syllable comes after a number and a measure word, so it usually lands at the end of a phrase — which means the descent can complete rather than being compressed by whatever follows.
Listen: 半
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现在两点半。
Xiànzài liǎng diǎn bàn.
It's half past two.
Listen: 现在两点半。
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现在两点半。 has liǎng and diǎn adjacent, both dipping, so liǎng rises: xiànzài liáng diǎn bàn. Before that, xiàn and zài both fall. So the sentence delivers two drops, a converted rise, a dip and a final drop — five syllables covering the full pitch range twice over.
Aspirating the b gives pàn. Keep the release silent. The nasal drifts back to bàng, which is a real word. And the liǎng diǎn conversion in the example sentence is one of the most frequently missed in the language, because telling the time is drilled early and the two numbers look like independent words on the page.