imabi.org/copular-sentences-ii%e3%80%80%e3%82%b3%e3%83%94%e3%83%a5%e3%83%a9%e6%96%87%ef%bc%88%e4%b8%81%e5%af%a7%e4%bd%93%ef%bc%89/
A grammar lesson on copular sentences in polite Japanese, explaining how to form statements with です, including present and past tense forms, negatives, and when to use polite speech.
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