-i and -na Adjectives in Japanese
-い Adjectives
The first type of adjective in Japanese is the – い adjective (-i adjective). These types of adjectives have an – い at the end of the word. For example: おいしい (oishii), which translates as delicious. Before using an – い adjective, we need to conjugate it to match the tense of the sentence. Let’s go over the different conjugations of an – い adjective, using おいしい as an example:
**Present Affirmative:**おいしい です。(oishii desu)
It is delicious.
We can position the adjective in two ways. The first puts the adjective after the noun:
この すし は おいしい です。(kono sushi wa oishii desu)
This sushi is delicious.
We can also place the adjective in front of the noun:
おいしい すし です。(oishii sushi desu)
(It is) delicious sushi.
Present Negative: おいしくありません。(oishikuarimasen)
It is not delicious.
When we make an – い adjective negative, we drop the last い and add the ending くありません. For example:
この とんかつ は おいしくありません。(kono tonkatsu wa oishikuarimasen)
This tonkatsu (breaded pork cutlet) is not delicious.
**Past Affirmative:**おいしかった です。(oishikatta desu)
It was delicious.
To make an – い adjective past affirmative, we drop the last い and add the ending かった. For example:
この すし は おいしかった です。(kono sushi wa oishikatta desu)
This sushi was delicious.
**Past Negative:**おいしくありませんでした。(oishikuarimasendeshita)
It was not delicious.
The past negative form of an – い adjective follows the pattern of the present negative form, except くありません becomes くありませんでした. For example:
この とんかす は おいしくありませんでした。(kono tonkatsu wa oishikuarimasendeshita)
This tonkatsu was not delicious.
Irregular -い Adjectives
Not all – い adjectives follow the same pattern. The exception is いい (ii), which means good. Let’s go over the conjugation:
Present Affirmative: いい です (ii desu)
It is good.
Present Negative: よくありません (yokuarimasen)
It is not good.
**Past Affirmative:**よかった です (yokatta desu)
It was good.
**Past Negative:**よくありませんでした (yokuarimasendeshita)
It was not good.
Note that when we conjugate いい, the stem changes to よく and then follows the regular pattern of conjugation.
-な Adjectives
The other group of Japanese adjectives is the -な adjectives. An example is げんき (な). Note that the actual adjective is げんき (genki), which means healthy or energetic; the な is added to connect the adjective and noun. For example:
げんき な おんあ の ひと。(genki na onna no hito)
The healthy woman.
When we use the long form of a -な adjective, the な is dropped. For example:
この おんあ の ひと は げんき です。(kono onna no hito wa genki desu)
This woman is healthy.
Let’s go over the conjugation for -な adjectives:
**Present Affirmative:**げんき です (genki desu)
(It is) healthy.
わたし は げんき です。(watashi wa genki desu)
I am healthy.
**Present Negative:**げんきじゃありません (genkijaarimasen)
(It is) not healthy.
When we form the present negative form of a -な adjective, we add じゃありません. For example:
きょう は わたし の ともだち は げんきじゃありません。(kyou wa watashi no tomodachi wa genkijaarimasen)
Today my friend is not energetic.
Past Affirmative: げんき でした (genki deshita)
(It was) healthy.
When we form the past affirmative form of a -な adjective, です is changed into its past tense. For example:
きのう は わたし の ともだち は げんき でした。(kinou wa watashi no tomodachi wa genki deshita)
Yesterday my friend was energetic.
**Past Negative:**げんきじゃありませんでした (genkijaarimasendeshita)
(It was) not healthy.
To form the past negative form of a -な adjective, we use the past form of じゃありません. For example:
いぬ は げんきじゃありませんでした (inu wa genkijaarimasendeshita)
The dog was not healthy.