Chinese · Pronunciation Guide
doo, rising from mid to high. Unaspirated d and a tightly rounded "oo", with the pitch climbing across it.
dú
The rise is fixed. Its role in sandhi is passive: because it is rising, any third tone in front of it keeps a full dip. In the very common phrase dú shū, the following syllable is a first tone, so nothing changes there either — the compound is tonally quiet.
Listen: 读
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我喜欢读书。
Wǒ xǐhuan dú shū.
I like to read.
Listen: 我喜欢读书。
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我喜欢读书。 opens with the wǒ xǐ sandhi, since both are third tones and adjacent, so wǒ rises. Then huan goes toneless, dú climbs, and shū holds high. The sentence therefore has two rises with a toneless valley between them and finishes on a level plateau — the pitch never really comes down after the start.
Aspirating the d gives tú, a different word, and English speakers aspirate initial stops before a stressed vowel almost automatically. The rounding is the other issue: a slack English "oo" makes the vowel too loose. Push the lips forward. And on a short rounded vowel the rise is easy to skip, so exaggerate the climb until it feels excessive.