一 yī
“one; single; a (article)”
numeral, adverb, time wordHSK 1 · 2021 list level 1
新HSK等级2025 HSK 3.0 syllabus level
一 appears in the November 2025 exam syllabus in the following numbered entry. Levels refer to the listed reading and use, not every meaning.
- Entry 254: 一 yī — Level 1; official annotation 1 (数). PDF page 86
Separate from the HSK 2.0 and 2021 list labels above. Compare the three lists.
用法How to use 一
一 means "one", the number 1. It is used before a measure word or a noun to count things, as in 一个人 (one person) or 一本书 (one book). When counting aloud or giving a phone number, it is simply 一.
例句Example sentences
- 我有一个哥哥。wǒ yǒu yí gè gē ge.I have one older brother.
- 请给我一杯水。qǐng gěi wǒ yì bēi shuǐ.Please give me one glass of water.
- 今天是一月一日。jīn tiān shì yī yuè yī rì.Today is January first.
常见错误Common mistakes
-
✗我有一书。
✓我有一本书。
Numbers like 一 need a measure word (本) before a noun.
-
✗一人们来了。
✓一个人来了。
一 counts single items, so it takes a measure word and a singular noun, not the plural 人们.