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Pinyin IPA [i˥] Zhuyin
HSK 1 numeral 数词 Book 1 · Lesson 5 (notes) freq #21

Meaning

The numeral 'one', and the first character every learner writes. Its tone changes with context — see the pronunciation note below.

Pronunciation Note

Tone sandhi: 一 is yī in isolation and counting; it becomes yí before a 4th-tone syllable (一个 yí gè) and yì before 1st/2nd/3rd tones (一天 yì tiān).

Examples

请看一看。 qǐng kàn yī kàn Have a look.
一会儿见! yī huì er jiàn See you soon!
请坐一下。 qǐng zuò yī xià Please sit down.

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