Chinese · Pronunciation Guide
run-shrr, with a hard-falling first syllable and a weak toneless second. Both consonants are retroflex, so the tongue stays curled throughout.
rènshi
The word's second half has lost its tone, giving the word a strong-weak shape. This is a common pattern in two-syllable verbs, and it is not optional in ordinary speech — pronouncing rèn shì with two full falls sounds like a dictionary reading rather than a conversation.
Listen: 认识
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我认识他。
Wǒ rènshi tā.
I know him.
Listen: 我认识他。
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我认识他。 gives you three quite different pitch events in four syllables: wǒ dips low, rèn drops from high, shi fades at that low pitch, and tā jumps back to the top. That leap from the toneless shi up to the level tā is the largest interval in the sentence and the thing most likely to be flattened.
English interference peaks on the r — rounding the lips and bunching the tongue gives an English "run", which is close but audibly foreign. Unround the lips and curl the tip back. The second syllable draws the usual "shee", with a vowel that is not there. And restoring the fourth tone to shi is the third common error, making the word sound over-enunciated.