Grammar Info
N5 Lesson 1: 1/12
To be, Is だ cannot be used with い-Adjectives
Noun +
[な]Adjective +
Part of Speech Auxillary Verb
Word Type Dependent Word
Register Casual
品詞 助動詞
単語の種類 付属語
使用域 タメ語
acts as an expression of determination or strong assertion in Japanese, and simply states that something ‘is’ a certain way. It is the casual equivalent of です (another auxiliary verb).
should always be attached to the end of nouns, or words similar to nouns, such as な-Adjectives.
  • アイスクリーム。(Noun + )
    It is an ice cream.
  • お寺(てら)。(Noun + )
    It is a temple.
  • 危険(きけん)。(な-Adj + )
    It is dangerous.
  • 大切(たいせつ)。(な-Adj + )
    It is important.
Caution: should never be attached to the end of い-Adjectives. In these cases, it is considered more correct to attach a polite equivalent, like です.
  • 大(おお)きい。(Unnatural)
    It is big.
  • 大(おお)きいです。(Natural)
    It is big.
Caution: Depending on circumstances, different expressions are used instead of . In polite language (when talking to people with whom we do not have a close relationship) it is です. In very formal writing (articles in encyclopedia, thesis) it is である.
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It is me.
Tae Kim's Japanese Grammar Guide
Page 29
みんなの日本語 I
Page 14 [CH 1]
みんなの日本語 I
Page 128 [CH 20]