你们

nǐ men

you (plural)

你

nǐ

you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)

们

men

plural marker for pronouns, and nouns referring to individuals

you (你) + plural people (们) = you all

你 combines 'person' with 尔, an older word for 'you,' making the character feel like 'the person addressed.' 们 adds a person radical with 门 for sound, turning any pronoun into a group.

你们都吃饭了吗？

nǐ men dōu chī fàn le ma？

Have you all eaten yet?

你们班有多少个学生？

nǐ men bān yǒu duō shao gè xué sheng？

How many students are in your class?