Mikagi-sama
When using adjectives, do you add an extra "i" and for "na" verbs u add an "I"? I'm sorry but I was learning and it didn't explain what to do for adjectives, it just said you can never have it end with "na"
if you mean using -na ending adjectives like setsuna you just put in front of the noun (setsuna shito) same for -i (atsui pan)
if you want to make and adverb
-i adjectived (like kakkoi) add ku (kakkoku)
-na becomes -ni (like shizukana to shizukani)
i dont know what you are say but if you mean at end of sentence, in normal language you just put the adjective at end. in formal for -na you take off na and put desu/da (shizukana-> shizuka desu)
and for -i adjective you put on at end desu/da or nothing if you dont want
otherwise this question doesnt much sense.