Chinese · Pronunciation Guide
gao with no puff of air, held high and flat. The pitch height suits the meaning, which is a helpful mnemonic.
gāo
No rule reaches this syllable. It is a stable neighbour too: any dipping tone in front of it keeps a full descent, and 不 before it stays as bù. In the very common hěn gāo, hěn therefore dips fully — a contrast worth drilling against hěn duǎn, where hěn rises instead.
Listen: 高
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我哥哥很高。
Wǒ gēge hěn gāo.
My brother is very tall.
Listen: 我哥哥很高。
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我哥哥很高。 keeps wǒ at a full dip before the level gē. Then gēge gives a high syllable plus a toneless echo, hěn sinks to the floor, and gāo leaps back to the top and holds. The sentence therefore ends on a sustained plateau rather than a movement, which is unusual and easy to under-produce.
An audible puff on the g gives kāo. Keep the release silent. The level tone is the other issue: a long glide that closes toward "oo" naturally invites the pitch to fall away with it, so learners produce something closer to a fourth tone. Hold the pitch at the top through the entire glide and then stop cleanly.