Chinese · Pronunciation Guide
guh — unaspirated k, back unrounded vowel, and in real speech usually no tone at all, even though the dictionary gives it a falling one.
gè
The subtlety here is that 个 behaves as a fourth tone for the purposes of calculating sandhi in the words around it, but as a neutral tone when actually spoken. That is why 一 becomes yí in front of it — the rule reads the underlying falling tone — even though what you hear afterwards is a weak, pitchless ge.
Listen: 个
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我要一个苹果。
Wǒ yào yí ge píngguǒ.
I want an apple.
Listen: 我要一个苹果。
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我要一个苹果。 makes this visible. The pinyin gives yí ge: 一 has risen because 个 is underlyingly falling, yet ge itself is written without a tone mark because it is spoken flat and weak. Then píngguǒ ends the sentence with a rise and a dip, and since guǒ is final it gets the full dipping contour.
The main error is giving it a strong, clearly falling pronunciation — "GUH!" — which turns a piece of grammatical connective tissue into a stressed word. It should be quick and almost thrown away. Aspiration is the other risk: an aspirated version becomes kè, a different syllable, and English speakers add that puff automatically after a vowel-final word like yí.