VocabularyHSK 3 · core

一

yī

one

Part of speech · numeral

Pattern visualization

一one

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Examples

我有一个弟弟。
I have one younger brother.
一加一等于二。
One plus one equals two.

Collocations

一个一次第一一起

Mnemonic

一 yī "one". Single horizontal stroke — most basic numeral. Tone sandhi: yī before 1st/2nd/3rd tones, yì before 4th tone, yi-neutral in ordinals (第一 dì-yī).

Quick check

Why 一个 = yí ge, not yī?