How?
어떻게
Why?
왜
How much?
얼마
How ___?
(re: How fast? How big?)
얼마나
How did you find it?
어떻게 찾았어요?
How did you get here?
어떻게 왔어요?
Why did you call?
왜 전화했어요?
Why didn’t you come?
왜 안 왔어요?
How fast is it?
구것은 얼마나 빨리 입니까?
How much is it?
얼마예요?
How much did you pay?
얼마 냈어요?
How often do you come?
얼마나 자주 와요?
How big is it?
얼마나 커요?
How heavy is it?
얼마나 무거워요?