Chinese · Pronunciation Guide
sheen, held high and flat, with the thin smiling x rather than an English "sh". The ending is a front n.
xīn
Level and undisturbing: any third tone before it keeps a full dip, and 不 before it stays as bù. It also shares its sound exactly with 心 xīn, "heart", so this is another true homophone pair separated only by context and character.
Listen: 新
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我买了一个新手机。
Wǒ mǎile yí ge xīn shǒujī.
I bought a new phone.
Listen: 我买了一个新手机。
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我买了一个新手机。 has wǒ and mǎi adjacent as third tones, so wǒ rises. Then le is toneless, yí is 一 converted before the underlyingly-falling ge, ge itself is spoken toneless, xīn holds high, and shǒujī gives a dip and a level. Three toneless syllables in an eight-syllable sentence, which is what keeps it moving.
The x drifts into English "sh", which pushes the word toward shēn — a real syllable and a different word. Spread the lips wide. The nasal is the other issue: xīng with a back nasal is extremely common, so the merger creates genuine ambiguity rather than mere accent. Check that your tongue tip actually touches the ridge at the end.