Chinese · Pronunciation Guide
nung, rising from mid to high. The vowel is a back unrounded sound and the ending is the nasal of "song".
néng
The climb is stable wherever it appears. Worth contrasting with 你 nǐ and 您 nín in terms of nasal endings: Mandarin distinguishes -en from -eng meaningfully, and 能 néng versus a hypothetical nén is exactly the kind of pair English ears do not register without training.
Listen: 能
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你能帮我吗?
Nǐ néng bāng wǒ ma?
Can you help me?
Listen: 你能帮我吗?
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你能帮我吗? starts with nǐ before the rising néng, so no sandhi applies and nǐ keeps its dip. Then bāng is high and level, wǒ dips, and ma is toneless. The question has no rising ending — the particle stays at whatever level wǒ left behind, which after a third tone means quite low.
The nasal is the recurring failure: learners produce "nen" with a front n, which is a different syllable shape entirely. Check by feeling your tongue tip — for -eng it should be resting behind your bottom teeth, doing nothing. The vowel is the other half: substituting "eh" as in "pen" fronts the whole syllable, when Mandarin wants the tongue pulled back.