Chinese · Pronunciation Guide
dzao, low and sagging. A "ds" onset at the teeth, then a long glide from "ah" toward "oo".
zǎo
Whether this dips or rises is decided by the neighbour, and its most common companions vary: in 早上 the following syllable is toneless so zǎo keeps its dip, while in hěn zǎo it comes second and the adverb converts instead. Same word, two different roles in the sandhi.
Listen: 早
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我今天起得很早。
Wǒ jīntiān qǐ de hěn zǎo.
I got up very early today.
Listen: 我今天起得很早。
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我今天起得很早。 ends with hěn and zǎo adjacent, both third tones, so hěn rises and zǎo keeps the full dip with its final lift: hén zǎo. Earlier, qǐ is followed by the toneless de, so it also keeps its dip. Three written third tones, one conversion — and the conversion is at the end, where beginners have usually stopped concentrating.
The z becomes an English z, losing the stop closure. Aspirating instead gives cǎo, which means grass. On the tone side, the word often appears at the end of a sentence where English would let the pitch drift down gently — but a dipping tone is not a gentle fall, it is a descent to the floor with a possible lift, and the difference is audible.