Chinese · Pronunciation Guide
wun-TEE: a hard-falling first syllable with lip-rounding, then a rising second with a strong puff of air.
wèntí
A drop straight into a climb, which is one of the harder transitions in Mandarin: the voice must reach the bottom and then immediately begin ascending. Practising the word as a single V-shaped gesture rather than two separate tones is the quickest way to get it fluent.
Listen: 问题
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我们有一个问题。
Wǒmen yǒu yí ge wèntí.
We have a problem.
Listen: 我们有一个问题。
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我们有一个问题。 protects wǒ with the toneless men, so it keeps its dip and yǒu keeps its own — the two are not adjacent. Then yí is the converted 一 before the underlyingly-falling ge. The sentence ends with the V of wèntí, so it finishes by climbing.
Too little breath on the t gives dí. Push the air. On the first syllable, learners drop the lip-rounding and produce "un", or over-round it into "woon". And the V transition gets smoothed: wèn stops short of the floor so tí has less distance to climb, which flattens the whole word into something mid-level.