Chinese · Pronunciation Guide
mun, short and toneless — a plural suffix that leans on the word in front of it rather than standing on its own.
men
Always neutral, never stressed, and structurally important for sandhi because it blocks adjacency. In wǒmen dōu, for instance, wǒ and dōu are not neighbours, and even where a third tone follows the suffix, wǒ is protected from having to rise by the toneless men sitting between them.
Listen: 们
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孩子们在外面玩。
Háizimen zài wàimiàn wán.
The children are playing outside.
Listen: 孩子们在外面玩。
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孩子们在外面玩。 attaches the suffix to háizi, whose second syllable is already toneless — so you get two weak beats in a row, zi and men, before zài drops sharply. That double-neutral stretch is easy to rush past; it should still be audible as two distinct short syllables rather than one blurred one.
Learners commonly give it a full clear vowel and equal timing, producing "MEN" as if it were the English word, which makes plural pronouns sound like two separate words. It should be quick, quiet and centralised. There is also a nasal risk: letting the ending drift to ng gives meng, and because the syllable is unstressed and fast, the drift happens easily without the speaker noticing.