Chinese · Pronunciation Guide
fahn, dropping hard. Ordinary f, a broad open vowel, and a front n.
fàn
Its own drop never moves, but the negator does: 不 before it becomes bú. The word to keep it apart from is 放 fàng, which shares the tone and the vowel and differs only in the nasal — so a back nasal turns dinner into an instruction to put something down.
Listen: 饭
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你吃饭了吗?
Nǐ chī fàn le ma?
Have you eaten?
Listen: 你吃饭了吗?
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你吃饭了吗? ends with le and ma, two toneless syllables in a row, so the question expires at the low pitch fàn left behind. Nǐ keeps its full dip because chī is level. There is no interrogative rise anywhere, despite the question mark, and adding one is the most common English interference in a sentence this simple.
The nasal merger is the specific danger here, since fàng is a real and common word. Finish with the tongue tip touching the ridge. The vowel is the second issue: English "fan" is too front and too tight, and Mandarin wants the jaw genuinely dropped. And the two toneless particles at the end tend to acquire tones and stress they should not have.