last night... 어젯밤 VS 어제밤 : Last night 오랫만~ VS 오랜만~ : Long Time No see I am really confused..sometimes i accidently read with "ㅅ" then sometimes not.. Which one the correct? or They have different meaning? Thank You..^-^

~수가 있/없, ~기에 안녕하세요..^-^ Straight to the point.. 1. ~을/ㄹ 수가 있/없,..= The "가", is it used for written or spoken ? What kind of situation ? Formal ? Informal ? 2. ~기에 = As far as i know. This one meaning is "because". Then when i can use it ? How about another "Because". ~니까, 어/아서? Is it interchangeable? 음..다른 질문을 있어요.하지만 기억할 수 없어요.아마 나중에. hem..There is a next question. But I can't remember. Maybe later. 제가 오랜문장을 이해하러 많은 시간 필요해요. I need more time to understand a long sentence.=_=! I'm really sorry if i make mistakes. 감사합니다. Terimakasih.

첫번째..1st 반말..... 오늘은 학교에 새로학생 있었어. Today there's a new student at school. 어머..그분을 바라보면 나한테 웃고 있었어.. Omg..When l was looking at her, she was smiling to me. 왜 이렇게인데? 내 마음이 마구 뛰어 뛰어.. Why being like this? My heart is beating beating so hard.. 그분는 술리이처럼 멋진군요! She is cool like Sulli (Fx)! 오아....어떡해? 한번만 또 사랑은 빠져죠..*후브 uwa..what should i do? once again I'm falling in love..*hufh

1990년 1월 20 일 안녕하세요..^-^ How to pronounce it? Which one the best ? and often using in daily life? 천 구백 구십 년 일월 이십일 or 십구구십년 일월 이십일 or there are some ways quicker to pronounce it? 감사합니다..^-^

About "미치다" 안녕하세요..^-^ Straight to the point.. What are the difference between 미쳐서, 미치게네, 미치게다, 미치늠, 미칠 것 같아 ? I am pretty sure about the last word's meaning. It's "Seems will crazy", isn't it? Now about the rests..=_=? Help please. Let me know if i make a mistake. 고마워요.^-^