'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'?

Question

'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'?

Answer

~ㄴ/는/ㄹ 것 같다 (geot gatta) means something you think/it appears/it seems to be ~. So for example, 쉬운 것 같아 means something appears easy, or 예쁜 것 같아 means something appears pretty or "I think it's pretty."

냐 (nya) is a question ending that I believe (not 100% certain on this) began as a form of -아니야? that kind of just faded to -냐? over time. Either way, is is merely used to mark the sentence as a question, though it can come off as kind of blunt depending on the context and who you are speaking to. However, you don't always have to use -냐 to ask basic questions: you might also use -니 or no ending at all. "미쳤어?" and "미쳤니? are also valid ways of saying it.

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