"I know." and "I don't know." in Japanese

  • しっています。Shitte imasu. I have knowledge/information. → I know.
    (casual しって(い)る。Shitte(i)ru.)
  • わかります。Wakarimasu. I understand. (I know.)
  • しりません。Shirimasen. I have no knowledge/information. → I don't know.
    (X しっていません。Shitteimasen.)
    (casual) しらない。Shiranai.
  • わかりません。Wakarimasen. I don't understand. (I don't know.)

X = no good, incorrect, wrong

Updated Dec 1, 2020