Chinese · Pronunciation Guide
shahng with the tongue curled back, dropping hard from high to low. Wide open vowel, back nasal ending.
shàng
The tone depends on the job: falling when it means "on" or "to go up", but toneless in 早上 zǎoshang and 晚上 wǎnshang, where the character has become a weak suffix. That split is worth memorising as two separate facts rather than one rule, because the tonal difference is what tells a listener which sense you mean.
Listen: 上
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
书在桌子上。
Shū zài zhuōzi shàng.
The book is on the table.
Listen: 书在桌子上。
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
书在桌子上。 ends on shàng, so the fourth tone gets its full descent with nothing after it to cut it short. Before that, zhuōzi is high plus toneless, and zài already fell once — so the sentence contains two drops with a flat stretch between them. The retroflex initials in shū, zhuō and shàng also make this a natural tongue-curling drill.
English speakers use the "sh" of "shop", tongue flat, which is the palatal-ish sound Mandarin reserves for x. Curl the tip back until the syllable sounds slightly hollow. The nasal is the second problem: shàn with a front n is a different syllable, and the merger happens silently because English treats the two nasals as interchangeable before a pause.