文法の説明

N5 レッスン 1: 10/12

い-Adjective

Adjectives ending in い

い-Adjectives cannot be used with だ

使い方・接続

おおき, おいし, はや

詳細

  • 品詞

    Adjective

  • 品詞

    Independent Word

  • 使用域

    Standard

  • 品詞

    形容詞

  • 単語の種類

    自立語

  • 使用域

    一般

「い-Adjectives」の情報

In Japanese い-Adjectives are known as 'form containing words', and are used to describe nouns. All い-Adjectives end in い in their base form.
  • (ぬる)(みず)
    Lukewarm water.
  • (せま)(みち)
    Narrow road.
As mentioned, all い-Adjectives end in い in their base form. However, not all words ending in い are い-Adjectives. Let's take a look at some of the words that are commonly mistaken for い-Adjectives.
  • バナナ(きら)い。
    I also don't like bananas.
  • (みず)きれい。
    The water is clear.
In きれい's case, it actually comes from the kanji structure 綺麗(きれい), with い being part of the kanji itself. This is never the case with い-Adjectives, where the い will always be outside of the kanji. Due to the kanji for 綺麗(きれい) being somewhat difficult, this word is often written in hiragana or katakana, which leads to confusion for learners. Unfortunately there is no rule for distinguishing which words ending in い are not い-Adjectives, but thankfully, there are not very many of them, so it won't be long before you become familiar with them.
Caution
Unlike な-Adjectives, い-Adjectives must never be followed by . This is due to only being able to conjugate with nouns (which な-Adjectives originally are). Instead, です is used with い-Adjectives to make them sound more polite.
  • 日本(みち)(せま)です
    Japan's roads are narrow.
  • 温泉(おんせん)風呂(ふろ)(あつ)です
    The onsen's baths are hot.
Fun Fact
Although using です with い-Adjectives is very common, it is actually incorrect Japanese. As です is simply a polite variation of , it follows all of the same conjugation rules as . This means that it should only be attached to nouns and な-Adjectives. However, as most Japanese natives do not know this rule, it is widely considered natural to use.

例文

  • (あつ)です

    It is hot.

  • 今日(きょう)(あつ)です

    It is hot today.

  • (さむ)です

    It is cold.

  • これ(たの)しいです

    This is fun.

  • (あたら)しい(くるま)

    A new car.

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「い-Adjectives」に関する文法ディスカッション

最近の返信 (合計37件)

  • Motifier

    Motifier

    約2ヶ月前

    It was provided before and they’ve said that theyll be fixing it asap, no idea what that time frame is though… - い-Adjective No longer show the word to right? - #2 by Asher

  • mietolim

    mietolim

    約2ヶ月前

    Thank you for providing the info!

  • Guguru-san

    Guguru-san

    約17時間前

    I’m a little confused about the example phrase 新しい車。 Wouldn’t either -い or -た have to go at the end to make it a correct sentence? I’m thinking either 新しい車だ or 車は新しい。Any thoughts?

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