V/A + -(으)ㄴ/는/(으)ㄹ 줄 알았다/몰랐다 – Thought That... / Didn't Know That...

Conjugation & Pattern

• Present: V + -는 줄 알았다/몰랐다 | A + -(으)ㄴ 줄 알았다/몰랐다 | N + 인 줄 알았다/몰랐다
• Past: V + -(으)ㄴ 줄 알았다/몰랐다 | A + -았/었던 줄 알았다/몰랐다
• Future / Expectation: V/A + -(으)ㄹ 줄 알았다/몰랐다 | N + 일 줄 알았다/몰랐다

Detailed Usage

Expresses a contrast between the speaker's prior assumption and actual reality: '-(으)ㄴ/는/(으)ㄹ 줄 알았다' means 'I thought that... (but I was wrong)'; '-(으)ㄴ/는/(으)ㄹ 줄 몰랐다' means 'I had no idea / didn't expect that...'.

Example Sentences

1. 1

   저는 영호 씨의 키가 작은 줄 알았는데 실제로 보니까 아주 크네요.

   Jeoneun yeongho ssiui kiga jageun jul aranneunde siljero bonikka aju keuneyo.

   I thought Youngho was short, but seeing him in person, he is very tall.

2. 2

   그 사람이 유진 씨의 남자친구인 줄 정말 몰랐어요.

   Geu sarami yujin ssiui namjachinguin jul jeongmal mollasseoyo.

   I really had no idea that he was Yujin's boyfriend.

3. 3

   한국어 공부가 이렇게 재미있을 줄 몰랐어요.

   Hangugeo gongbuga ireotge jaemiisseul jul mollasseoyo.

   I didn't expect studying Korean to be this fun.