That's because ~
그건 ~이기 때문이야(~라서 그래)
1> That's because you don't eat breakfast.
2> That's because the weather is getting colder.
3> That's because he doesn't know anything.
1> 그건 네가 아침을 먹지 않기 때문이야.
2> 그건 날씨가 점점 더 추워지기 때문이야.
3> 그건 걔가 아무것도 모르기 때문이야.
That's because / you don't eat breakfast.
그건 ~이기 때문이야 / 너는 아침을 먹지 않는다
That's because / the weather is getting colder.
그건 ~이기 때문이야 / 날씨가 점점 더 추워지고 있다
That's because / he doesn't know anything.