Chinese · Pronunciation Guide
Not "she" and not "shr" exactly. Curl the tongue tip back, hiss, and let the vowel be little more than a buzz held in that same position — then drop the pitch sharply.
shì
One syllable, one tone, no sandhi. What deserves attention instead is how often 是 loses weight in running speech: as a linking verb it is frequently spoken quickly and lightly, though unlike a true neutral-tone particle it never abandons the falling contour outright — it just gets compressed.
Listen: 是
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我是学生。
Wǒ shì xuésheng.
I am a student.
Listen: 我是学生。
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我是学生。 sets a low third tone (wǒ), a sharp fall (shì) and a rise (xué) side by side in three beats, which is a useful pitch drill in itself. Because xué is a second tone, wǒ before it stays low; and shì falling into a rising syllable creates a distinct V-shape across the middle of the sentence.
Two errors travel together here. The first is pronouncing it "she", using the English vowel and a flat English "sh" — that is a different Mandarin syllable entirely. The second is letting the fourth tone become a level mid pitch, which is what English does to short function words. Say it as though you were closing an argument: high, then straight down.