以

以 (yǐ) currently has the following grammatical points associated with it:

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

Not what you're looking for? Check the wiki page for yi or search for 以