📘 Grammar 60: How to Use ~나 보다 / ~은가 보다 – Expressing Guess or Assumption in Korean

📘 How to Use ~나 보다 / ~은가 보다 – Expressing Guess or Assumption in Korean

Want to say “I guess he’s tired,” “It seems cold,” or “She must be busy” in Korean?

Then it’s time to learn ~나 보다 and ~은가 보다, which are used to make educated guesses or assumptions based on what you see, hear, or feel.

This grammar is very natural in spoken Korean and helps you express uncertainty, possibility, or logical conclusion.

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📌 What Do ~나 보다 / ~은가 보다 Mean?

• ~나 보다: used after action verbs
• ~은가 보다: used after descriptive verbs (adjectives)

They both mean:

• ✔️ “I guess...”
• ✔️ “It seems that...”
• ✔️ “Apparently...”

Structure:

• Action verb stem + ~나 보다
• Descriptive verb/adjective stem + ~은가 보다

✔️ In the past tense, use:
- ~았/었나 봐요
- ~았/었는가 봐요

📘 Example Sentences

• 피곤하나 봐요 – I guess he’s tired
  pi-gon-ha-na bwa-yo
• 눈이 오는가 봐요 – I guess it’s snowing
  nun-i o-neun-ga bwa-yo
• 바쁜가 봐요 – I guess she’s busy
  ba-ppeun-ga bwa-yo
• 모르는가 봐요 – I guess he doesn’t know
  mo-reu-neun-ga bwa-yo
• 늦었나 봐요 – I guess (he) is late
  neu-jeot-na bwa-yo

📊 Grammar Table – ~나 보다 / ~은가 보다

Type	Form	Example	Meaning
Action verb (present)	~나 보다	가나 봐요	I guess he’s going
Descriptive verb	~은가 보다	춥은가 봐요 → 춥나 봐요	I guess it’s cold
Past tense	~았/었나 봐요	늦었나 봐요	I guess he was late
Descriptive (past)	~았/었는가 봐요	좋았는가 봐요	I guess it was good

💡 When to Use ~나 보다 / ~은가 보다

• ✔️ When making a guess or assumption based on observation
• ✔️ When you're unsure but making a logical conclusion
• ✔️ Often used in daily conversation

Examples:

• 비가 오나 봐요 – I guess it’s raining
• 그 사람이 학생인가 봐요 – I guess that person is a student

❗ Common Mistakes

• ❌ 가는가 봐요 → ✅ 가나 봐요
• ❌ 예쁜나 봐요 → ✅ 예쁜가 봐요
• ~나 보다 is not used for confirmed facts – only for guesses

🧪 Mini Quiz – Test Yourself!

1. How do you say “I guess she’s sick”?
   a) 아픈가 봐요
   b) 아프나 보다
   
   Click to Show Answer

   ✅ a) 아픈가 봐요

2. Translate: “I guess he’s sleeping.”
   a) 자고 있나 봐요
   b) 자는가 봐요
   
   Click to Show Answer

   ✅ a) 자고 있나 봐요

3. Which is correct for “I guess it was fun”?
   a) 재미있는가 봐요
   b) 재미있었나 봐요
   
   Click to Show Answer

   ✅ b) 재미있었나 봐요

✅ Conclusion

Now you can express assumptions and guesses in Korean using ~나 보다 / ~은가 보다!

• Use ~나 보다 with action verbs
• Use ~은가 보다 with adjectives
• Conjugate to the past using ~았/었나 봐요

Practice these:

• “I guess he’s angry” → 화난가 봐요
• “I guess she already left” → 벌써 간 것 같아요 / 벌써 갔나 봐요

📘 Coming Up Next

Next lesson: How to Use ~거든요 – Giving Reasons in Korean
Learn how to say “Because I was tired,” “I didn’t go because it rained,” and more!

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