eulgeol
probably; should have
Used for a casual guess, or to express regret about something you didn't do.
Rule: This is casual speech; the polite form is -을걸요. After a consonant use -을걸 (먹을걸), after a vowel or ㄹ drop the 을 (갈걸). For regret it usually appears as -을걸 그랬어, meaning 'I should have ~'.
아마 문 닫았을걸.
It's probably closed.
그때 말할걸.
I should have said something then.
미리 예약할걸 그랬어요.
I should have booked in advance.
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