Chinese · Pronunciation Guide
fahng, dropping hard. An ordinary f, a wide open vowel, and the back nasal of "song".
fàng
The verb itself is tonally inert. As an imperative verb it commonly follows 请 or 把, and there the interesting change happens upstream: qǐng bǎ puts two third tones in contact, so qǐng rises before the sentence even reaches this verb.
Listen: 放
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请把书放在桌子上。
Qǐng bǎ shū fàng zài zhuōzi shàng.
Put the book on the table.
Listen: 请把书放在桌子上。
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请把书放在桌子上。 opens with exactly that sandhi — qǐng and bǎ are adjacent third tones, so qǐng becomes rising: qíng bǎ. After that the sentence delivers three falling tones with breaks between them: fàng, zài and shàng, separated by the high shū and the high-plus-toneless zhuōzi. Each fall must restart at the top rather than sliding on from the last.
Expect the vowel to come out too tight — English "fang" has a flat front vowel where Mandarin wants a wide open "ah". Drop the jaw. The nasal, as always, drifts forward to fàn, which is a real and very common word meaning rice or a meal, so this is a contrast with genuine consequences at the dinner table.