Chinese · Pronunciation Guide
bay, with no breath after the b and the pitch held high and dead level throughout.
bēi
Nothing in the tone system disturbs this syllable. As a measure word it does affect what comes before: 一 in front of bēi becomes a falling yì, and any third-tone number such as liǎng or jiǔ keeps its full dip since bēi is not a third tone.
Listen: 杯
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我想要一杯咖啡。
Wǒ xiǎng yào yì bēi kāfēi.
I would like a cup of coffee.
Listen: 我想要一杯咖啡。
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我想要一杯咖啡。 gives you wǒ xiǎng, a third-third pair that forces wǒ to rise, then the falling yào, then yì bēi with 一 already converted. Kāfēi finishes on two high level syllables, so the sentence ends on a sustained plateau that includes bēi as its first step — three high level syllables in a row if you count it, which is a real test of pitch stability.
Let breath escape on the b and bēi becomes pēi, and English aspirates initial voiceless stops as a matter of course. Practise by holding a strip of paper in front of your lips and keeping it still. The tone error is the familiar one: letting a level tone sag, especially at the end of a phrase, which turns it into a fourth. Sustain and then stop.