Summary of I-Adjectives and Na-Adjectives

The table below indicates the differences and similarities Between I-Adjectives and Na-Adjectives.

	I-Adjectives	Na-Adjectives
Used with a noun	Just add I-Adjective right before a noun. E.g. たかい本 Takai hon (expensive book) たかい本です。 Takai hon desu. (It is) an expensive book.	add Na-Adjective right before a noun but “Na” should be added between the Na-Adjective and the noun. E.g. すきな人 Suki na hito (favorite person) あの先生は、わたしのすきな人です。 Ano sensee wa watashi no suki na hito desu. (That teacher is my favorite person.)
Used with -desu	Just add I-Adjective right before –desu E.g. たかいです。 Takai desu. (It is) expensive.	Just add Na-Adjective right before –desu E.g. ゆうめいです。 Yuumee desu. (It is) famous.
Negative forms	Change the last –I into Ku and add “arimasen” or “nai desu.” E.g. たかくありません。　 　　たかくないです。(It is) not expensive.	Just add “de wa arimasen” or “de wa nai desu.” "De wa" is casually pronounced as "jaa" in spoken language. (the "Wa" is the particle so it is written with "は(not わ)." Note: Remember how to say “(I) do not like (something)? (something) wa suki jaa arimasen. E.g. ゆうめいではありません。 ゆうめいではないです。 (It is) not famous.