山田（やまだ）さんの犬（いぬ）は大（おお）きい。

暑（あつ）いです。

今日（きょう）は暑（あつ）いです。

これは楽（たの）しいです。

それは、高（たか）いです。

可愛（かわい）い女（おんな）の子（こ）。

私（わたし）の家（いえ）は近（ちか）いです。

私（わたし）の姉（あね）の家（いえ）は古（ふる）い。

これは、美味（おい）しいです。

寒（さむ）いです。

新（あたら）しい車（くるま）。

面白（おもしろ）いゲーム。

<div class='writeup-body'>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.<ul class='writeup-examples--holder'><li class='writeup-example'><div class='writeup-example--japanese'>温（ぬる）い水（みず）。</div><div class='writeup-example--english'>Lukewarm water.</div></li><li class='writeup-example'><div class='writeup-example--japanese'>狭（せま）い道（みち）。</div><div class='writeup-example--english'>Narrow road.</div></li> </ul>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.<ul class='writeup-examples--holder'><li class='writeup-example'><div class='writeup-example--japanese'>バナナも嫌（きら）い。</div><div class='writeup-example--english'>I also don't like bananas.</div></li><li class='writeup-example'><div class='writeup-example--japanese'>水（みず）はきれい。</div><div class='writeup-example--english'>The water is clear.</div></li></ul>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.<div class='writeup-caution'><div class='caution-header'>Caution</div>Unlike な-Adjectives, い-Adjectives must never be followed by だ. This is due to だ 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.<ul class='writeup-examples--holder'><li class='writeup-example'><div class='writeup-example--japanese'>日本の道（みち）は、狭（せま）いです。</div><div class='writeup-example--english'>Japan's roads are narrow.</div></li><li class='writeup-example'><div class='writeup-example--japanese'>温泉（おんせん）の風呂（ふろ）は熱（あつ）いです。</div><div class='writeup-example--english'>The onsen's baths are hot.</div></li></ul></div><div class='writeup-funfact'><div class='funfact-header'>Fun Fact</div>Although using です with い-Adjectives is very common, it is actually incorrect Japanese. As です is simply a polite variation of だ, it follows all of the same conjugation rules as だ. 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.</div></div>

Grammar Info

い-Adjective

Adjectives ending in い