Let’s learn about "뭐라고?”

뭐라고요? : What did you say?

[other expressions]

1) to younger people or friends

- 뭐?

- 뭐라?

- 뭐라고?

- 뭔데?

- 뭐라 했어?

- 뭐라고 했어?

- 무엇이라 했어?

- 무엇이라고 했어?

2) to younger people or friends with a little honourific by ‘-요’

- 뭐요?

- 뭐라고요?

- 뭔데요?

- 뭐라 했어요.

- 뭐라고 했어요.

- 무엇이라 했어요?

- 무엇이라고 했어요?

3) to the elerly or unfamiliar people with more honourific by ‘-시’

- 뭐라 하셨어요?

- 뭐라고 하셨어요?

- 무엇이라 하셨어요?

- 무엇이라고 하셨어요?

- 뭐라 하셨습니까?

- 뭐라고 하셨습니까?

- 무엇이라 하셨습니까?

- 무엇이라고 하셨습니까?

[explanations]

* 뭐? : a short form of 무엇(what)

* 뭐라? : 뭐(what) + -라(a short form of -라고)

* 뭐라고? : 뭐(what) + -라고

* 무엇이라? : 무엇(what) + -이(the stem of 이다) + -라(a short form of -라고)

* 무엇이라고? : 무엇(what) + -이(the stem of 이다) + -라고

* 이다 : be

* -라 / -라고 : (1) saying that it is; call-ing it (by name) (2) "quote" (3) [with 뭐•무엇] What did you say? 

- 작고 흰 토끼는 "왠 일 있니?" 라고 물어봤습니다 : "What's the matter?" asked the little white rabbit

* 뭔데? : 뭐(what) + -ㄴ데?

* -ㄴ데 / -는데 : a interrogative verb ending suffix expresses a light feeling or regret, etc. by seeking consent or opinion from others in one's own words

* 하다 : (1) do (2) [=말하다] say; tell; speak in the sentence

* 했다 : past tense of 하다  by ‘-었-‘

* 하셨다 : 하(the stem of 하다) + 시(a suffix makes a verb more honourific) + -였(a suffix makes a verb past tense) + -다(a descriptive basic verb ending suffix)

* 했어? : 했(the stem of 했다) + -어(a non-honourific interrogative verb ending suffix)

* 하셨어요? : 하셨(the stem of 하셨다) + -어(an interrogative verb ending suffix) + -요(an honourific verb ending suffix)

* 하셨습니까? : 하셨(the stem of 하셨다) + -스(a suffix makes a verb more honourific) + -ㅂ니까(an honourific interrogative verb ending suffix)

* a noun? + -요 : an honourific verb ending suffix

* a noun + -라 / -라고 / -ㄴ데 : a non-honourific interrogative verb ending suffix

* a verb + -어: a non-honourific interrogative verb ending suffix

* -라고 / -ㄴ데 / -는데 / -어? + -요 : an honourific verb ending suffix

* a verb + -습니까? : an honourific interrogative verb ending suffix