Overview
This connective ending, V+(으)ㄴ/는지, is used to express a reason or cause for a subsequent action or state, but with a nuance of indirectness, uncertainty, or vagueness. Unlike more direct causal endings like -아서/어서 or -(으)니까, this form suggests that the speaker is either not entirely sure of the exact reason, choosing not to state it explicitly, or offering a speculative explanation. It often implies a "guess" or "it seems that..." quality to the reason.
Usage
It typically connects a preceding clause that provides a less-than-definitive reason to a following clause that describes an action, state, or observation. The reason presented with -(으)ㄴ/는지 is often something the speaker has inferred, observed, or is simply speculating about. It can be used to soften a statement or to avoid sounding too assertive about the cause. For example, if someone is late, you might say "차가 막혔는지 늦었어요" (They were late, perhaps because of traffic) rather than "차가 막혀서 늦었어요" (They were late because of traffic), implying a slight uncertainty or a less direct attribution.
Conjugation Rules
This ending attaches to verbs (action and descriptive) and nouns + 이다.
1. Action Verbs (동사)
- Present Tense: V-는지
- 먹다 -> 먹는지 (perhaps they eat/are eating...)
- 가다 -> 가는지 (perhaps they go/are going...)
- Past Tense: V-았/었는지
- 먹다 -> 먹었는지 (perhaps they ate...)
- 가다 -> 갔는지 (perhaps they went...)
2. Descriptive Verbs (형용사)
- Present Tense:
- Stem ends in a consonant: A-은지
- 좋다 -> 좋은지 (perhaps it's good...)
- 많다 -> 많은지 (perhaps there are many...)
- Stem ends in a vowel or ㄹ: A-ㄴ지
- 예쁘다 -> 예쁜지 (perhaps it's pretty...)
- 길다 -> 긴지 (perhaps it's long...)
- Past Tense: A-았/었는지
- 좋다 -> 좋았는지 (perhaps it was good...)
- 예쁘다 -> 예뻤는지 (perhaps it was pretty...)
3. Nouns + 이다 (N + 이다)
- Present Tense: N-인지
- 학생이다 -> 학생인지 (perhaps they are a student...)
- Past Tense: N-이었는지 / -였는지
- 학생이었다 -> 학생이었는지 (perhaps they were a student...)
Knowledge Plus
- Distinction from -아서/어서 or -(으)니까: While -아서/어서 and -(으)니까 state a direct and often definitive reason, -(으)ㄴ/는지 implies a less certain or more speculative cause. It's often used when the speaker is making an inference or doesn't want to sound too absolute.
- Often followed by expressions of uncertainty or observation: It frequently precedes verbs like 모르겠다 (I don't know), 궁금하다 (to be curious), or observations like ~것 같다 (it seems). However, it can also precede an action or statement that is a consequence of the vague reason.
- Can also be used for questions: Note that -(으)ㄴ/는지 is also used in indirect questions (e.g., "그 사람이 누구인지 모르겠어요" - I don't know who that person is). While structurally similar, the context differentiates its use as a vague reason. When used for vague reasoning, it's a connective ending, not a question ending; the following clause usually provides the consequence or observation.