Let's learn about "당연"

* 당연 : [當然] the stem of 당연하다; this is often used instead of 당연한 / 당연하다

* 당연한 : rightful; proper; fair; reasonable; natural; justifiable; just

- 그가 땅의 소유권을 주장하는 것은 당연한 이치이다 : It stands to reason that he should claim the ownership of the land

- 그가 사과했다고 들었는데, 지극히 당연한 일이다 : I hear that he apologized, which was only right

- 그렇게 하는 것은 주부로서 아주 당연한 일이다 : It is quite natural[reasonable] for a wife to act that way

- 그녀가 그를 피하는 것에는 당연한 이유가 있다 : She shuns him with (good) reason. / She has (a) good reason for shunning him

- 그가 당연한 일인듯 나의 허락을 맡으러 왔다 : He came to ask my permission as a matter of course

* 당연하게 : an adverb form of 당연하다 by '-게"

* 당연하다 : be rightful; be proper; be fair; be reasonable; be natural; be justifiable; be just; [=놀랄 일이 아니다] be no wonder

* 당연했다 : past tense of 당연하다 by '-었-'

- 그가 그렇게 말했다면 미움을 받는 게 당연하다 : He deserves to be disliked for having said such a thing

- 그녀가 자식들의 성공을 자랑으로 여겼던 것은 당연하다 : She was justly proud of her children's success

- 당신이 그렇게 말하는 것도 당연하다 : You may well say so. / You are quite right in saying so

- 자네가 불평을 하는 것도 당연하다 : Your complaint is understandable[justifiable]

- 그가 화를 내는 것도 당연하다 : It is natural for him to get angry [that he should get angry]

- 너는 사직하는 것이 당연하다 : It is only proper that you should resign (from) your post

- 당신이 화를 내는 것은 당연하오 : It is natural that you should be angry. / You have good reason to be angry

- 외투도 입지 않고 추운 밖에 나갔으니 그가 감기 든 것은 당연하지 : It is not surprising that he has caught a cold since he was out in the cold without a coat on

- 빚을 갚아야 한다는 것은 당연하지 뭐냐 : It is only proper for you to pay your debt

- 그의 말은 아주 당연했다 What he said was most proper[reasonable]

* 당연하오 : 당연하다 + -오(([formal, moderately addressee-raising] A sentence-final ending used to describe, ask a question, give an order or a request)

* 당연하지 : 당연하다 + -지(A sentence-final ending used when the speaker confirms and says something that the listener thought he/she already knew)

* -하지 뭐야 : It is only proper for someone to do ~