Chinese · Pronunciation Guide

How do you pronounce "为什么" in Chinese?

Q: How do you pronounce 为什么 in Chinese?

为什么 is pronounced with the stress described below. In IPA it is written /weɪ˥˩.ʂən˧˥.mɤ/. It means “why.” way-SHUN-muh: a hard fall, then a rise, then a toneless syllable. Down, up, and out.

way-SHUN-muh: a hard fall, then a rise, then a toneless syllable. Down, up, and out.

为什么 /weɪ˥˩.ʂən˧˥.mɤ/

wèishénme

Fall, rise, nothing. No sandhi applies, but the shape matters: because the phrase ends on a toneless syllable sitting high, the whole question finishes in the upper range — and English speakers then add an extra interrogative rise on top of that, which is both unnecessary and wrong.

Listen: 为什么

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Sound it out

wèi The lips purse for the glide, then a tight diphthong from "eh" to "ee". The pitch dives from high to low, so the question opens with a drop.

shén Tongue curled back for the retroflex hiss, then a short central vowel closed at the ridge. The voice climbs back up from where wèi left it.

me Toneless and reduced, a quick m onto a schwa, riding at the top where shén finished. Short enough that it barely registers as a separate beat.

Hear it in a sentence

你为什么不来？

Nǐ wèishénme bù lái?

Why aren't you coming?

Listen: 你为什么不来？

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你为什么不来？ keeps 不 in its default falling form, because lái is a rising tone and only a following fourth tone would trigger the switch to bú. Nǐ also keeps its dip since wèi falls. So the question runs dip, fall, rise, nothing, fall, rise — and learners who over-apply the 不 rule here produce bú lái, which is wrong.

Where English speakers slip

Two things. The retroflex in shén is flattened into an English "sh", drifting toward the thin x sound. And the 不 in the example sentence gets converted unnecessarily by learners who have drilled bú shì and bú duì — the rule fires only before a falling tone, and lái climbs. Check the next syllable every time.