I didn’t know you had a sister in Korean 🇰🇷

Sentence info.

Breakdown of the sentence:

1. "네게"
 – Derived from 너 (informal “you”) combined with -게 (a shortened form of 에게, meaning “to [someone]").
  Romanized: ne-ge

2. "여동생이"
 – "여동생" means “younger sister” and the subject marker -이 indicates that “여동생” is the subject of the verb "있다".
  Romanized: yeo-dong-saeng-i

3. "있다는"
 – From 있다 (“to exist” or “to have”) combined with -다는, which converts the clause “여동생이 있다” into an adjectival clause meaning “that [you] have a younger sister.”
  Romanized: it-da-neun

4. "것을"
 – "것" means “thing” or “fact,” and -을 marks it as the object of the main verb. This whole noun phrase “the fact that you have a younger sister” is what is not known.
  Romanized: geot-eul

5. "몰랐어"
 – Past tense of 모르다 (“to not know”) in an informal style, meaning “didn’t know.”
  Romanized: mol-las-seo

Tips to remember:
• When reporting a fact or statement as an object, use the pattern “[clause]다는 것” to turn it into a noun phrase.
• The subject particle -이 is attached to the noun being described (여동생).
• Words like “몰랐어” show past tense informal speech; recognizing these endings helps understand the time frame and formality level.

Alternate ways to say “I didn't know you had a sister”:
• 네게 여동생이 있는 줄 몰랐어.
 Romanized: ne-ge yeo-dong-saeng-i it-neun jul mol-las-seo.
• 네가 여동생이라는 사실을 몰랐어.
 Romanized: ne-ga yeo-dong-saeng-i-ra-neun sa-sil-eul mol-las-seo.

These alternatives use “있는 줄”, implying “I didn’t realize that…” or “이라는 사실” to mean “the fact that…”.

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