Chinese · Pronunciation Guide
lay, dropping hard from high to low. A bright forward l and a tight diphthong, with the fall doing all the work.
lèi
No rule touches this syllable, but its neighbours react: 不累 becomes bú lèi, since a falling tone triggers the negator's switch. And the extremely common hěn lèi keeps hěn at a full dip, because 累 falls rather than dips — a distinction learners routinely blur.
Listen: 累
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我今晚很累。
Wǒ jīnwǎn hěn lèi.
I'm tired tonight.
Listen: 我今晚很累。
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我今晚很累。 has two third tones, wǒ and hěn, neither of which changes: wǒ is followed by the level jīn and hěn by the falling lèi. So both keep their full descent, and the sentence sinks twice with a high plateau between. Ending on a plunge after a dip gives the complaint its weary shape.
English speakers say "lay" with a level, drawn-out delivery, which reads as a first tone and does not mean tired. The pitch must fall. The l is a secondary issue: a dark, velarised English l pulls the following vowel backward and makes the syllable sound closer to lòu. Keep the tongue forward and the sound bright.