Chinese · Pronunciation Guide
chee-SHRR, both syllables rising. An aspirated palatal then a retroflex, with two climbs that each need their own reset.
qíshí
Two rising tones in succession, unchanged by any rule but physically demanding: after the first climb ends high, the voice must drop back down to begin the second. Native speakers do this so quickly it is inaudible as a fall, but skipping it entirely leaves the second syllable level. The word is a good drill for exactly that reset.
Listen: 其实
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其实我不知道。
Qíshí wǒ bù zhīdào.
Actually, I don't know.
Listen: 其实我不知道。
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其实我不知道。 keeps 不 in its falling form, because zhī is a level first tone. Wǒ also keeps its dip, since bù falls. So the sentence runs rise, rise, dip, fall, level, fall — six syllables covering every tone in the system except a neutral one, which makes it an unusually complete drill.
Both initials collapse together: q is made forward with spread lips and heavy aspiration, sh with the tongue curled back and no aspiration at all, and learners produce a single English "ch"/"sh" for both. Say them as a contrasting pair. The double rise is the other trap, usually flattening into one long plateau across both syllables.