Chinese · Pronunciation Guide
bee with no puff of air, low and sagging. Short and simple to articulate; the tone is the whole difficulty.
bǐ
The next syllable decides. Its neighbourhood is crowded — bī, bí and bì are all real syllables — so the dip is genuinely load-bearing. Because pens are usually counted, the measure word before it matters more than what comes after: a dipping measure word would force 笔 upward only if it came first, which it does not.
Listen: 笔
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你能借我一支笔吗?
Nǐ néng jiè wǒ yì zhī bǐ ma?
Can you lend me a pen?
Listen: 你能借我一支笔吗?
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你能借我一支笔吗? shows the falling branch of the 一 rule: zhī is a level tone, so 一 becomes yì. Nǐ keeps its dip because néng rises, and wǒ keeps its dip because yì falls. Then bǐ dips and ma fades toneless. Three unchanged dipping tones and one converted 一.
Letting air out on the b gives gives pǐ. Keep the release silent. The vowel is often laxed toward the "i" of English "bit" when Mandarin wants a tense, fully spread "ee". And in the example sentence, learners produce yī zhī with a level 一 rather than the converted falling yì.