Chinese · Pronunciation Guide
jyo, one beat, on a low sagging pitch. The j is unaspirated and made high against the palate, and the vowel glides more than the spelling suggests.
jiǔ
Everything here depends on the syllable that comes next. Before another third tone — jiǔ běn, for instance — it converts to a rising second. Before a first, second or fourth tone it keeps the full dip. Alone, as when giving a phone number, it gets the complete dipping contour.
Listen: 九
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我九点上班。
Wǒ jiǔ diǎn shàngbān.
I start work at nine.
Listen: 我九点上班。
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我九点上班。 chains three third tones at the front: wǒ, jiǔ and diǎn. Mandarin resolves such runs by raising all but the last, so wǒ and jiǔ both rise and only diǎn stays low. Then shàngbān delivers a fall and a level tone. Getting this sentence right means accepting that two written third tones will not sound like third tones at all.
Most beginners flatten the vowel to "joe", losing the initial "ee" glide, and simultaneously aspirate the j into a "ch", which pushes the word toward qiū. Keep the air in and start the vowel at "ee". The tone is the third problem: as with all third tones in connected speech, learners try to produce a full dip-and-rise on every occurrence when the low portion alone is usually what is wanted.