common mistake part Ⅰ 知っている shitte(i)ru (= I know) BUT 知らない shirA-nai (=I don't know) Using 知る shiru and 知っていない "shitteinai" are wrong.
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common mistake part Ⅰ 知っている shitte(i)ru (= I know) BUT 知らない shirA-nai (=I don't know) Using 知る shiru and 知っていない "shitteinai" are wrong.