-되

Provided that, But, On the condition that

Explanation

This expression indicates that the speaker acknowledges or accepts the content in the preceding clause but that there is a condition or additional explanation in the following clause. Often, the following clause will include imperative forms or related forms such as -아야/어야 한다 and -(으)면 안 된다.

Details

1. This expression can also be used in the forms -기는 -되 and -기는 하되.

천연자원을 최대한으로 이용하기는 이용하 생태계를 파괴해서는 안 된다.
이야기를 충분히 나누어서 의견을 수렴하기는 하되 원칙은 지키도록 하세요.


2. The form -으되 is used after endings expressing tense, such as -았/었 and -겠 as well as after 있다/없다.

그분은 이미 떠났으되 그분의 영향력은 아직도 남아 있다.
그 사람을 만나러 가기는 가겠으되 오래 있지는 못할 거야.


3. This expression is also used when the contents of the preceding clause and the following clause are in contrast.

그 사람은 말은 잘하되 실천하지는 않는다.
That person speaks well, but he doesn't put his words into action.
이웃집 남자는 돈은 많이 있으되 시간이 없어서 돈을 쓸 수 없다고 한다.
The man next door says he has a lot of money but that he doesn't have enough time to spend it.

Examples
<span class="speaker-a">가:</span> 엄마, 저 숙제 다 했는데 잠깐 나가서 놀다 와도 돼요?<br><br><span class="speaker-b">나:</span> 그래, 나가서 놀<span class='focus'>되</span> 저녁 먹기 전까지는 들어와.
A: Mom, I’ve done all my homework, so can I go outside and play for a while? B: Yeah, it’s okay to go out and play, but come back before we eat dinner.
<span class="speaker-a">가:</span> 네. 아 참, 준호네 할아버지가 시골에서 과수원을 하신대요. 친구들이 이번 방학에 여행도 할 겸 도와 드리러 가자고 하는데 갔다 와도 돼요? 친구들은 다 간대요.<br><br><span class="speaker-b">나:</span> 그래? 그럼 방학에 여행을 가기는 가<span class='focus'>되</span> 엄마 걱정 안 하게 자주 전화해야 한다.
A: Okay. By the way, Junho said that his grandfather has run a fruit orchard in the countryside. Some of my friends are talking about taking a trip this coming vacation and also helping him out at the orchard, so is it okay if I go with them? All of my friends said they are going. B: Really? Well, then it’s okay if you go on a trip during the vacation, but you have to call me often so that I don’t get worried about you.
천연자원을 최대한으로 이용하<span class='focus'>되</span> 생태계를 파괴해서는 안 된다.
It is okay to use natural resources as much as possible, but we must not destroy the ecosystem.

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