About
HSK levels

    1. ah (used to express surprise)
    2. (onom.) creaking

    呀,我忘记了! ya, wo wang ji le!

    ya

    1. (particle equivalent to 啊 after a vowel, expressing surprise or doubt)

    你怎么在这里呀? nǐ zěnme zài zhèlǐ ya?