Simplified:

On the HSK 1 vocabulary list, at CEFR level A1.

lái ㄌㄞˊ

    • to come
    • hither (directional complement for motion toward the speaker, as in 回來|回来[hui2 lai5])
    • (used as a substitute for a more specific verb)
    • ever since (as in 自古以來|自古以来[zi4 gu3 yi3 lai2])
    • for the past (amount of time)
    • the coming ... the next ... (as in 來世|来世[lai2 shi4])

      prefix

    • in order to

      between two verbs

    • approximately

      after a round number

    • (used after 得[de2] to indicate possibility, as in 談得來|谈得来[tan2 de5 lai2], or after 不[bu4] to indicate impossibility, as in 吃不來|吃不来[chi1 bu5 lai2])

Where 來 is used

Sources