Speculation & Uncertainty

Quick Reference

Pattern	Usage	Certainty Level	Example
-ㄴ/는/ㄹ 것 같다	General speculation	Medium	비가 올 것 같아요
-ㄴ/나 보다	Inference from evidence	Higher	비가 오나 봐요
-ㄹ지도 모르다	Possibility/uncertainty	Lower	비가 올지도 몰라요

-ㄴ/는/ㄹ 것 같다 (It seems like...)

Formation

Descriptive verbs & past tense: - Add -ㄴ after vowel stems: 크다 → 큰 것 같다 - Add -은 after consonant stems: 작다 → 작은 것 같다 - Past: -았/었던 것 같다

Action verbs (present): - Add -는: 가다 → 가는 것 같다

Future: - Add -ㄹ/을: 가다 → 갈 것 같다

Noun + 인 것 같다

Usage

General speculation based on feelings, thoughts, or weak evidence:

Examples:

저 식당이 맛있는 것 같아요.
That restaurant seems delicious.

그 사람이 학생인 것 같아요.
That person seems to be a student.

내일 날씨가 좋을 것 같아요.
The weather will probably be good tomorrow.

어제 늦게 잤던 것 같아요.
I think I went to bed late yesterday.

Common Patterns

With 좀 (seems a bit):

좀 추운 것 같아요.
It seems a bit cold.

Negative:

안 좋은 것 같아요. (descriptor negative)
안 가는 것 같아요. (action verb negative)

-ㄴ/나 보다 (It appears to be...)

Formation

Descriptive verbs: - Add -ㄴ after vowel stems: 크다 → 큰가 보다 - Add -은 after consonant stems: 작다 → 작은가 보다

Action verbs: - Add -나: 가다 → 가나 보다

Past tense: - -았/었나 보다: 갔나 보다

Noun + 인가 보다

Usage

Inference based on observed evidence or strong reasoning. Implies you've noticed something that leads you to this conclusion:

Examples:

불이 켜져 있어요. 집에 있나 봐요.
The lights are on. (They) must be home.

문이 잠겨 있어요. 아무도 없나 봐요.
The door is locked. Nobody must be there.

우산을 가져왔네요. 비가 오나 봐요.
You brought an umbrella. It must be going to rain.

지갑을 놓고 왔나 봐요.
I must have left my wallet behind.

Key Difference from -ㄹ 것 같다

-ㄴ/나 보다 = Evidence-based inference -ㄹ 것 같다 = General feeling/opinion

배가 고픈가 봐요. (I hear stomach growling → inference)
배가 고픈 것 같아요. (I feel hungry → feeling)

-ㄹ지도 모르다 (Might be...)

Formation

All verbs: - Add -ㄹ after vowel stems: 가다 → 갈지도 모르다 - Add -을 after consonant stems: 먹다 → 먹을지도 모르다

Past possibility: - -았/었을지도 모르다: 갔을지도 모르다

Noun + 일지도 모르다

Usage

Express uncertainty or possibility. Less confident than -ㄹ 것 같다:

Examples:

내일 눈이 올지도 몰라요.
It might snow tomorrow. (low certainty)

그 사람이 올지도 몰라요.
That person might come.

길을 잘못 찾았을지도 몰라요.
We might have taken the wrong way.

사고가 났을지도 모릅니다.
There might have been an accident.

Shortened Form

-ㄹ지 몰라(요) (more casual):

늦을지 몰라요.
(I) might be late.

Usage Context

Often used when: - Expressing worry or concern - Suggesting alternative possibilities - Hedging statements to sound less certain

Certainty Spectrum

From most to least certain:

1. -ㄴ/나 보다 (evidence-based) → "clearly appears to be"
2. -ㄹ 것 같다 (general feeling) → "I think/seems"
3. -ㄹ지도 모르다 (possibility) → "might be"

Practice Exercises

Exercise 1: Choose the Right Pattern

Fill in with -ㄹ 것 같다, -나 보다, or -ㄹ지도 모르다:

1. (Looking at dark clouds) 비가 _____.
2. (Just a feeling) 내일 시험이 어려_____.
3. (Hearing someone coughing) 감기에 걸렸_____.
4. (Not sure) 그 사람이 한국 사람_____.
5. (Seeing closed shop) 오늘 문을 닫았_____.

Exercise 2: Translate

1. The food seems delicious.
2. He must be busy. (You see he's not answering calls)
3. She might not come to the party.
4. I think I've been here before.
5. It appears they've already left. (Evidence: empty office)

Exercise 3: Situation-Based

What would you say in these situations?

1. You hear loud music from next door and think your neighbor is having a party.
2. You're not sure but you think the store might be closed on Mondays.
3. You feel like it's going to rain, but there's no specific evidence.
4. You see someone wearing a uniform and conclude they work here.
5. You think you might have made a mistake, but you're not certain.

---

Answer Key

Exercise 1: 1. 올 것 같아요 / 오나 봐요 (both work, depending on evidence) 2. 울 것 같아요 3. 나 봐요 4. 일 것 같아요 / 일지도 몰라요 5. 나 봐요

Exercise 2: 1. 음식이 맛있는 것 같아요 2. 바쁜가 봐요 3. 파티에 안 올지도 몰라요 4. 전에 여기 왔던 것 같아요 5. 벌써 떠났나 봐요

Exercise 3: 1. 옆집에서 파티를 하나 봐요 2. 월요일에는 문을 닫을지도 몰라요 3. 비가 올 것 같아요 4. 여기서 일하시나 봐요 5. 실수했을지도 몰라요

Common Mistakes

1. Using -나 보다 without evidence:

❌ 그냥 그럴 것 같아요. → 그럴 나 봐요.
✓ 그럴 것 같아요. (just a feeling, no evidence)

2. Wrong tense with -는 것 같다:

❌ 어제 갈 것 같아요. (future form for past)
✓ 어제 간 것 같아요. (past form)

3. Confusing action vs. descriptive verb forms:

❌ 바쁘나 봐요. (descriptive verb with action verb ending)
✓ 바쁜가 봐요.

Natural Usage Tips

1. Add 좀 for softening: 좀 어려운 것 같아요
2. Combine with question endings for tentativeness: 갈 것 같은데요?
3. Use in negative for polite disagreement: 그건 아닌 것 같아요
4. Stack for extreme uncertainty: 갈 것 같을지도 몰라요

Cultural Note

Koreans use these patterns constantly to avoid being too direct or certain. Using definitive statements can sound: - Arrogant (too confident) - Rude (too direct) - Awkward (socially inappropriate)

Practice hedging your statements with these patterns to sound more natural and culturally appropriate.