Chinese · Pronunciation Guide
tah with a strong puff of air and a high, flat pitch. The aspiration is not optional — it is what separates this from 搭 dā.
tā
The high plateau is permanent. As a pronoun it is frequently spoken quickly, but unlike English "he" it does not reduce to a schwa or lose its pitch — Mandarin does not have that kind of vowel reduction for pronouns, so even a fast tā stays high and open.
Listen: 他
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他是我哥哥。
Tā shì wǒ gēge.
He is my brother.
Listen: 他是我哥哥。
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他是我哥哥。 puts the high tā against the falling shì, then wǒ dips, then gēge gives a high syllable plus a toneless echo. Notice the reduplicated kinship term: the second 哥 loses its tone entirely, the same pattern as in 谢谢. So the sentence ends with a high plateau that simply fades out rather than resolving.
Under-aspirating is the classic error, since English speakers reduce aspiration on unstressed function words and pronouns feel unstressed. Without the puff of air, tā drifts toward dā. Hold a hand in front of your mouth and make sure you feel it. The vowel also tends to shorten to the a of "cat"; open it out and let the syllable have some length.