Chinese · Pronunciation Guide
bahng with no puff of air, held high and flat. Wide open vowel, back nasal ending, and a level pitch that must not sag.
bāng
Immune to change, like every level tone. Its practical significance in this word list is as a sandhi blocker: in nǐ bāng wǒ, the pronoun nǐ keeps its full third-tone dip because bāng is level and stands between it and wǒ. Verbs with first tones are useful anchors like this.
Listen: 帮
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你能帮我一下吗?
Nǐ néng bāng wǒ yíxià ma?
Can you give me a hand?
Listen: 你能帮我一下吗?
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你能帮我一下吗? shows 一 doing its trick: it precedes xià, a falling tone, and so becomes a rising yí. Elsewhere in the sentence, nǐ keeps its dip before the rising néng, and wǒ keeps its dip before the converted yí. The question closes on a toneless ma with no rise at all.
Breath escaping after the lips gives pāng, a different syllable, and English speakers add breath to initial stops as a matter of course. Practise with a hand in front of your mouth. The other error is the nasal: bān with a front n is a completely different word, and because the vowel before it is open in both cases, the only difference is where the tongue ends up. For ng, it should end up nowhere near the teeth.