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Examples of the 1→2 Tone Change
: - 一 个 yī gè → yí gè one (of something)
- 一下 yīxià → yíxià [after a verb] quickly, briefly, casually
- 一半 yībàn →yíbàn one half
- 一 次 yī cì → yí cì first; first time; once; (math.) linear (of degree one)
- 一样 yīyàng→yíyàng the same (as)
Examples of the 1→4 Tone Change : -
一起 yīqǐ → yìqǐ together
- 一点 yīdiǎn→yìdiǎn a bit; a little
- 一 天 yī tiān→yì tiān one day
- 一些 yīxiē→ yìxiē some
- 一 年 yī nián→yì nián one year
Exceptions
When 一 (yī) appears as an ordinal number (as in "first"), or as a number in a series, address, or date, it is pronounced without the tone change (regular first tone "yī"). Example : - 一 二 三 四 五yī èr sān sì wǔ one, two, three, four, five
- 第 一 个dì yī ge the first one
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