Part 11: Adjectives

There are two types of adjectives in Japanese: い-adjectives and な-adjectives. い-adjectives all end with ～い (ex: たのしい) while な-adjectives end with ～な, even though they end with ～な (ex:すき[な]). The ～な is often times excluded from the words that fall under this category because it isn't used most of the time. い-adjectives and な-adjectives conjugate differently:
たのしい  --  Fun
すき(な)  --  Like

い-adjectives:

		Affirmative		Negative
present	|	～いです	|	～くないです
	|		|	or (～くありません)
Past	|	～かったです	|	～くなかったです
	|		|	or (～くありませんでした)

な-adjectives:

		Affirmative		Negative
present	|	～です	|	～じゃないです
	|		|	or (～じゃありません)
Past	|	～でした	|	～じゃなかったです
	|		|	or (～じゃありませんでした)

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Along with い-adjectives and な-adjectives, there is also one that is irregular. This adjective is いい (good). The ending of いい follows the same pattern as い-adjectives, but in most cases the first い changes to a よ. While いい is the only irregular adjective, there are other adjectives that end with いい, like かっこいい. Here is a chart of how to conjugate irregular adjectives:

		Affirmative		Negative
present	|	いいです	|	よくないです
	|		|	or (よくありません)
Past	|	よかったです	|	よくなかったです
	|		|	or (よくありませんでした)

These chart show how to use the adjectives when you are explaining a subject. Here is an example:
こん本はむずかしいです。 "This book is difficult."
むずかしい  --  Difficult

When using an adjective along with some type of action, you put the adjective before the subject. Here are two examples:
おもしろいえいがをみませんでした。 "I didn't see an interesting movie."
きれいなへやにいきます。 "I will go to the clean room."
おもしろい  --  Interesting / Amusing / Funny
きれい(な)  --  Clean / Beautiful
へや  --  Room