Chinese · Pronunciation Guide
bun, roughly, with no puff on the b, a front n at the end, and a pitch that drops low and stays there.
běn
As a measure word, this syllable spends its life forcing changes on the numbers in front of it: any number in front of it that carries a third tone must rise. Wǔ běn becomes wú běn; jiǔ běn becomes jiú běn. And 一 in front of it becomes yì, falling, since 本 is a third tone.
Listen: 本
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我买了一本书。
Wǒ mǎile yì běn shū.
I bought a book.
Listen: 我买了一本书。
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我买了一本书。 is dense with tone events. Wǒ mǎi puts two third tones in contact so wǒ rises; le is toneless; yì is 一 already converted to a falling tone before the third-tone běn; běn keeps its dip; and shū is high and level at the end. Five syllables, four different tonal states.
English speakers hear "ben" and use the vowel of "bed", which is too open and too far forward. Relax toward a central "uh" instead. Aspiration is the other habitual slip: a puff of air makes it pēn, and since the following word is often a noun starting with a vowel or a fricative, the mistake carries clearly. Finally, keep the n forward — běng is not a syllable, but the habit of letting nasals drift back is strong.