분명히 -ㄹ/을 것이다 (bunmyeonghi -l/eul goes-ida) is a structure that means “I am sure” or “must be.” The first part, 분명히 (bunmyeonghi), is an adverb that means “clearly” or “certainly.” -ㄹ/을 것이다 (-l/eul goes-ida) is a way to express one's assumption or guess. So together, it means “I'm sure” or “must be,” and we use these two parts like a pair quite often.
You change the word 분명히 (bunmyeonghi) to other words to alter the nuance of the statement. For example, if you say 아마 (ama – “maybe”) instead of 분명히 (bunmyeonghi), the phrase means, “it could be” instead of “it must be.”
The last part, 것이다 (geos-ida), changes depending on the politeness level.
- Intimate: 거야 (geo-ya)
- Standard: 거예요 (geo-yeyo)
- Formal: 것입니다 (geos-imnida)
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