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Understanding Chinese Pinyin: Sandhi of the "一" (yī)


In Mandarin Chinese Pinyin System, the "一"(yī) can keep the original tone (1st tone, high level), only as an ordinal number or at the end of the sentence or read alone. If "一"(yī) appears before the other four tones, it would have tone sandhi.

1. If ""() appears before the 4th tone, the tone of ""() has to change to the 2nd tone and the tone pitch need to change from 55 to 35. [5535; ]
    一半(yībàn, one half); 一旦(yīdàn, once, in case)
    一定(yīdìng, fixed, certainly); 一度(yīdù, once, for a time)
    一概(yīgài, one and all); 一共(yīgòng, altogether)

2. If ""() appears before another tone (not a 4th tone but a 1st tone or 2nd tone or 3rd tone), the tone of ""() has to change to 4th tone and the tone pitch changes from 55 to 51. [5551; ]
    Before 1st tone :一般(yībān, general); 一些(yīxiē, some)
    Before 2nd tone:一同(yītóng, together); 一群(yīqún, a group of)
    Before 3rd tone:一早(yīzǎo, early in the morning); 一起(yīqǐ, together)

3. If ""() appears between the same verbs, the tone change to the neutral tone.
    听一听(tīngyītīngtīngyitīng, listen to)
    学一学(xuéyīxuéxuéyixué, study, learn)
    写一写(xiěyīxiěxiěyixiě, write)
    看一看(kànyīkànkànyikàn, look at)