Chinese · Pronunciation Guide
dzai, rhyming with "eye", on a hard falling pitch. The z is a "ds" cluster made right at the teeth, not an English z.
zài
Its own pitch never budges. Its influence on neighbours is where it matters: 不 before 在 becomes bú, and 一 before it becomes yí. As a very high-frequency preposition, 在 is one of the most common triggers for both of those changes.
Listen: 在
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我在家。
Wǒ zài jiā.
I am at home.
Listen: 我在家。
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我在家。 is three syllables covering three different pitch shapes: wǒ low, zài falling, jiā high and level. Wǒ keeps its full dip because zài is not a third tone. The sentence ends up sounding like a descent followed by a jump back to the top, which is a very typical Mandarin contour and quite unlike anything English does with a three-word sentence.
The initial is the usual casualty: learners say "zye" with an English z, which is voiced and made without the stop closure. Mandarin's z begins with the tongue actually touching, then releasing into the hiss. The other frequent slip is levelling the tone because the word is grammatical and feels unimportant — but a level zai does not read as 在 to a listener.