About
HSK levels

    1. surname Yu

    1. sentence-final interrogative particle
    2. to go; to take
    3. variant of 於|于[yu2]

    1. (of time or place) in; at; on
    2. (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for
    3. (indicating a source) from; out of
    4. (used in comparison) than
    5. (used in the passive voice) by

    我于去年在北京认识了他。 Wǒ yú qùnián zài Běijīng rènshi le tā.