A : I'm sorry I'm late.
   -늦어서 미안해요

B : What took you so long?
   -왜 이렇게 오래 걸렸어요?

A : I took the wrong bus.
    -버스를 잘못 탔어요.

B ; Oh, did you? That's very easy to do.
   -그랬어요? 그럴수도 있죠.