Let's learn about "내가 왜 그랬지?"

내가 왜 그랬지? : Why did I do that?

[other expressions]

- 내가 왜 그랬니? (to younger people or friends)

- 내가 왜 그랬냐? (to younger people or friends)

- 내가 왜 그랬어? (to younger people or friends)

- 내가 왜 그랬는가? (to younger people or friends)

- 내가 왜 그랬는지? (to younger people or friends)

- 내가 왜 그랬지? (to younger people or friends)

- 내가 왜 그랬을까? (to younger people or friends)

- 제가 왜 그랬어요? (honourific by '-요')

- 제가 왜 그랬는가요? (honourific by '-요')

- 제가 왜 그랬는지요? (honourific by '-요')

- 제가 왜 그랬지요? (honourific by '-요')

- 제가 왜 그랬죠? (a short form of 그랬지요)

- 제가 왜 그랬을까요? (honourific by '-요')

- 제가 왜 그랬습니까? (formal; honourific by '스')

[explanations]

* 내 : I (non-honourific word)

* 제 : I (honourific word)

* -가 : a particle makes 내 / 제 the topic of the senhence after a word ends in a vowel

If you want to emphasize what, use 은 or 는.

If you want to emphasize who, use 이 or 가

* 왜 : why

* 그러하다 / 그렇다 : [Pronunciation: 그럳타] be so; be such

* 그랬다 : [Pronunciation: 그랟따] past tense or present perfect of 그러하다/그렇다

* a verb + -니? / -냐? / -어? / -는가? / -는지? / -지? / -을까? : a non-honourific interrogative verb ending suffix

* a verb + -지요? / -죠? / -는가요? / -는지요? / -을까요? / -습니까? : an honourific interrogative verb ending suffix by ‘-요’ / ‘스’