For conjugaison: http://dongsa.net/?search=하다

It will be appropriate to use the final ending form "-아/어/여요". 케이팝 콘서트에 처음 가는 거예요. If you want a simpler sentence: 케이팝 콘서트에 처음 가요.

나는 공부하기 전에 집"에" 간다. The verb '가다' takes '에' to mark its spatial location.

아줌마 난데 매생이굴국 하게 매생이 좀 손질해놓고 굴 사놓은 것 좀 얼음 """넣어서""" 냉장고에 보관해놔주고 어 그 오징어깍두기 김치 냉장고에 이제 넣어놔 너무 삭으면 안돼 도현이 오면 아기 취향(?) ** 먹이고 아홉시 들어갈게 Her (윤손하?) pronunciation is really not clear! She pronounced "도현이 오면 '와귀' 재워논 거 좀 먹이고" . She may have meant "아귀"? It is a kind of fish.

될 사람이 됐다고 생각한다 is a well-written Korean sentence. This is a compound sentence composed of (1) 될 사람이 됐다 + 고 (particle for quotation) + (2) (나는) 생각한다 means "I think the person who had been supposed to become got it. '되다' is translated as 'become' often but in this case, with the little ㄹ (an adnominal ending for "future"), it gets to mean "a person who was supposed to become (who was deserved)". The verb '되다' means 'become' often but it is used to mean sort of "turn out well, succeed" as well.

-(은) 거예요 is not a verbal form. '것' is a commonly used bound noun (meaning not used alone). Koreans use the sentence structure with '것' a lot! '것' means a thing literally. 1. 그건 그 사람한테서 받았어요 means: I received it from the person. 2. 그건 그 사람한테서 받은 거예요 means: That is a thing that I received from the person. The main difference is that 1 is a simple sentence whereas 2 is a compound phrase. Within the phrase 2, there is a embedded phrase which is (그건) 그 사람한테서 받았다. '- 것' is used to convert the embedded phrase into a sort of Noun in order to make a A is B sentence (그건 N예요) This sentence structure is not familiar to English speakers so just practice often until you get used to it!

왜냐면 is the abbreviated form of: (1) 왜 (2) 냐고 하면 (a form of quoted speech 냐고 + 하면 means if): shortened to 냐면 (1) + (2) = 왜냐면 In addition, 왜냐하면 is a different adverb meaning the same.

Literally speaking, you don't have anything special (bad), do you?