Chinese · Pronunciation Guide
jee, low and sagging. Unaspirated palatal j onto a tense "ee", with the pitch sinking to the bottom.
jǐ
As a question word it almost always precedes a measure word, and many measure words are third tone — jǐ běn, jǐ bǎ, jǐ diǎn — in which case 几 converts to a rising tone. Before ge, which is spoken toneless, it keeps its full dip. So the same question word alternates constantly depending on what is being counted.
Listen: 几
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你要几个?
Nǐ yào jǐ ge?
How many do you want?
Listen: 你要几个?
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你要几个? keeps jǐ at a full dip, because ge is toneless and offers nothing to trigger a change. Nǐ also keeps its dip, since yào falls. The question therefore has two unchanged third tones and ends on a weightless syllable, so it finishes at the bottom of the range with no rise at all despite the question mark.
Let breath escape on the j and you have qǐ, a different word. Keep the breath in. The bigger issue is the alternation described above: learners produce a full dip everywhere, so jǐ diǎn comes out as two laboured low syllables instead of a rise and a dip. Since asking the time is one of the first things anyone learns, this particular miss is very audible.