'geot gata' is that we use 'gata@gatta'( dont know the real spelling) when we want to say something that already past n already happen? and one more -if we wanna said "are you crazy?", then we must put the words (nnya?) like micyeo-nnya? or pabo-nnya?( i think it sound like that) what the real mean of that 'NYYA'?

FORMAL/INFORMAL i dont wanna look rude to korean people when talking with them.. so someone please help me... please give me some example of formal and informal words.. such (eat,dring,this,taht, and many more..) and, is that when we put words 요 and ㅂ니다 mean formal?

when we use this korean words? 당신,네가,너 and 나,내가,나는,난,전 i really want to know this

나의 문제 i've big problem .. i can read hangul, understand many basic words, and also can pronounce well.. but.... i never can write it properly, and spell it correctly.. look this... this is very sad u know? none of this is correct... 아뇽하세요(x) 안용하세요(x) 안뇽하세요(x) 안녕하세요 now i know how hard it is.. but im still keep trying on it!!!!