Chinese · Pronunciation Guide
JEE-duh, a hard-falling first syllable followed by a weak toneless second. The j has no puff of air.
jìde
Falling plus neutral, giving a heavy-light rhythm. Its main tonal interest is what happens in front of it: because jì is a fourth tone, 不 immediately before it converts to a rising bú. That is a rule about the underlying tone of jì, and the toneless de plays no part in it.
Listen: 记得
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我不记得他的名字。
Wǒ bú jìde tā de míngzi.
I don't remember his name.
Listen: 我不记得他的名字。
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我不记得他的名字。 shows the negator change: bú rather than bù, because jì falls. Wǒ keeps its dip since bú is rising. Then de is toneless, tā holds high, another de is toneless, and míngzi gives a rise plus a final toneless syllable. Three of the eight syllables carry no tone, which is what makes the sentence flow rather than march.
Learners restore a fourth tone to de, producing jì dé or jì dè, both of which sound over-articulated. Let it go slack. The 不 rule is the other frequent casualty: saying bù jìde ignores the falling tone of jì and is one of the most audible sandhi errors a beginner makes, because this exact phrase comes up constantly.