Japanese na-adjectives

な－ａｄｊ． are prenominals meaning they end in な when they are before a noun.

な is the attributive form of the copula です. If the な－ａｄｊ． is at the end of the sentence the な changes to another form of desu.

Ｅｘａｍｐｌｅｓ
しずか な せいとです。 ｏｒ せいと が しずか です。
She's a student who is quiet. えい語 の いみ は ひらがな か 漢字 で 書いてください。