Translation of "뭔가가" in English

하지만 뭔가가 아주 잘못돼 왔습니다.

But something has gone horribly wrong.

만약 여러분이 배우고 싶은 뭔가가 있다면

It’s for anything that you want to learn:

바꿔야 할 뭔가가 있는 것 같았죠.

Something that needed to be changed

뭔가가 소를 죽이고 동굴로 끌고 와 먹었나 봐요

Something has killed that, dragged it into this cave to eat.