저는 배가 고파서 밥을 많이 먹었어요.

Jeoneun baega gopaseo babeul manhi meogeosseoyo.

I ate a lot because I was hungry.

그는 성격이 좋아서 친구가 많아요.

Geuneun seonggyeogi joaseo chinguga manhayo.

He has a lot of friends because he has a good personality.

나는 기차가 늦어서 회사에 늦었어요.

Naneun gichaga neujeoseo hoesae neujeosseoyo.

I was late to the office because the train was late.

이 방이 너무 시끄러워서 공부를 할 수 없어요.

I bangi neomu sikkeureowoseo gongbureul hal su eopseoyo.

I can't study because this room is too noisy.