Expression dictionary — full article
Guessing & Possibility · might; could; don't know if/whether; perhaps
The grammatical pattern (으)ㄹ지(도) 모르다 is used to express uncertainty or possibility regarding a future event, a current state, or a past action whose outcome or truth is unknown. It literally translates to "don't know if/whether..." but functionally conveys a sense of "might" or "could" happen. The optional particle 도 emphasizes the possibility, making it sound like "even might" or "could possibly."
This expression is primarily used when the speaker is speculating about an outcome or acknowledging that something might happen without being certain. It can apply to:
(으)ㄹ지(도) 모르다 attaches to verb and adjective stems, as well as the past tense marker -았/었-.
The core of this expression is -(으)ㄹ지, which is a connective ending used to ask indirect questions or express uncertainty. Adding 모르다 (to not know) directly conveys "I don't know if/whether..." The optional 도 particle adds a subtle emphasis on "even" or "also," making the possibility sound slightly more pronounced or unexpected. This pattern is very similar in meaning to -을 수도 있다 (could also be), but (으)ㄹ지(도) 모르다 often carries a stronger sense of personal speculation or a direct statement of not knowing. It's frequently used in everyday conversation when discussing plans, predictions, or uncertain outcomes.