Yi

The pinyin yi could possibly refer to a number of different words.

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一 (yī)

• Structure of numbers (A1)
• Reduplication of verbs (A2)
• Events in quick succession with "yi... jiu..." (B1)
• Expressing "one by one" with "yi" (B1)
• Expressing "one of" with "zhiyi" (B1)
• Expressing various aspects with "yi fangmian" (B1)
• Expressing "not even one" (B2)

亿 (yì)

• Big numbers in Chinese (A2)

以 (yǐ)

• Before a specific time with "yiqian" (A2)
• After a specific time with "yihou" (A2)
• Cause and effect with "yinwei" and "suoyi" (A2)
• Expressing "mistakenly think that" with "yiwei" (B1)
• Defining upper and lower limits (B2)
• Using "yi... wei..." (C1)
• "In order to avoid" with "yimian" (C1)

免 (yǐ)