i- adjectives ans na-adjectives in japanese

ok im slightly confused as to which of these to use when describing something.
the examples i have seen show
aka-i (red)
kirei-na (pretty)

taka-i yama (a high mountain)
kirei-na hana (a pretty flower)

Im confised as to which i use at which situations.

please someone explain this to me.

I think the "na" ending is more formal than just "i", but I'm not too sure, nihongo nuubu desu.

I thought it was just two different classes of adjective? I may be wrong... I don't know much Japanese...

WHY ARE YOU MAKING A THREAD ON THIS YOU FUCKING WEEABOO GO TO THE JAP ASK QUESTIONS THREAD

>>4
Calm down. This guy is clearly a complete retard. I mean, he's using romaji. -__-

Uh.. there's two different types of adjectives. I and NA adjectives.. an adjective can only be one type. So when you look up an adjective in a dictionary it will tell you which one it is, and when you use that adjective before a noun like in your examples, you put the i or na after the adjective.

俺以外のこのスレの全員は、日本語を勉強すんな。低能な奴が欲しくないからさ。

>>3
True.

>>5
Maybe he's writing from u"nterdevice, without proper input methods? (just like my PC on work and phone)


>>Disregarding that<<
Where is our traditional "日本語 Ask a question thread"?

>>8
its on /lang/

あなたのおまんこをペロペロしたい!

あなたは なんじかん ですか