な Adjectives

Two forms of Japanese Adjectives, there are い(i,) and な(na) adjectives. As i said previously I don't know if there is a system or any sort of rule for these other than they just are that way.
Bellow are some な adjectives,

べんり     ->  Benri convenient
ゆうめい ->  Yuumei famous
きれい    ->  Kirei pretty
しんせつ ->  Shinsetsu helpful
ひも　     ->  Himo not busy/available

In use:

えいじい　おくだ　は　ゆうめい　です。
Eiji Akuda wa yuumei desu.
Eiji Akuda is famous.

えいじい　おくだ　は　ゆうめい　な　やくしゃ　です。
Eiji Akuda wa yuumei na yakushya desu.
Eiji Akuda is a famous actor. (Na な is the connecting particle when modifying a noun)

When being used in the negative form we add　ではありません。

しんせつではありません
shinsetsudewaarimasen. not helpful.


These posts are proving to be a great way for me to revise, i hope anyone reading this also finds it helpful. Should you notice any mistakes please contact me and tell me. I am learning and would really appreciate to be made aware of any mistakes.
On that note any feed back is welcome and i would love to hear from others learning Japanese.

ありがと