B2 · Intermedio alto Capítulo 15

Expressing Certainty and Logic

5 Reglas totales
51 ejemplos
5 min
Reglas en este capítulo Práctica rápida

Chapter in 30 Seconds

Master the art of logical deduction and unwavering certainty in natural Korean conversation.

  • Express logical probability based on external circumstances.
  • Deny possibilities and confirm absolute facts with authority.
  • Make educated guesses about the past and concede points gracefully.
Speak with conviction, reason with logic.

Lo que aprenderás

In this chapter, you're about to take a big leap and speak like a true Korean native! You'll move beyond just saying "I'm sure or I think"; you'll learn to precisely and subtly convey your level of certainty and logic in your speech. Imagine your friend hasn't arrived yet, and you see heavy traffic; by learning «-ㄹ/을 법하다,» you can say, "They're likely stuck in traffic." Or, when you're 100% sure something is impossible, with «-ㄹ 리가 없다,» you can decisively say, "There's no way!" In this lesson, you'll learn powerful tools like «-ㄹ/을 게 분명하다» to express yourself without a shred of doubt when you're absolutely certain about something. Wow, how great it is not to worry anymore! You can even use «-았/었을 것이다» to logically deduce about past events you didn't personally witness, like

They must have gone out yesterday.
These structures fit together like a puzzle, allowing you to express anything from a likely guess to absolute certainty in the best possible way. After this chapter, you'll be able to confidently express your opinions with reasoning and certainty in any conversation. You'll even learn how to use «-기는 하다» to concede a point politely before adding a small but and qualifying your statement. Ready for a much deeper and more authentic Korean conversation? Let's get started!

Learning Objectives

By the end of this chapter, you will be able to:

  1. 1
    By the end you will be able to describe likely scenarios using -ㄹ/을 법하다 based on logical reasoning.
  2. 2
    By the end you will be able to strongly negate impossible situations using -ㄹ 리가 없다.
  3. 3
    By the end you will be able to reconstruct past events logically using -았/었을 것이다.

Guía del capítulo

Overview

Welcome, B2 Korean learners! Are you ready to elevate your Korean grammar to a truly native-like level? This chapter is your gateway to expressing certainty and logic with precision and nuance.
Moving beyond simple I think or "I'm sure," you'll master expressions that allow you to convey exactly how confident you are about a statement, or how logically you've deduced something. This is a crucial step in achieving fluency and engaging in deeper, more authentic conversations.
At the B2 CEFR level, the expectation is to communicate effectively in a wide range of situations, and that includes expressing your thoughts with conviction and sound reasoning. By learning structures like -ㄹ/을 법하다 for likelihood, -ㄹ 리가 없다 for impossibility, -ㄹ/을 게 분명하다 for absolute certainty, and -았/었을 것이다 for logical past deductions, you'll gain the tools to articulate your opinions with confidence. You'll even learn -기는 하다 to gracefully concede a point before introducing a counter-argument.
These advanced Korean grammar patterns will make your speech more sophisticated and natural, helping you sound less like a textbook and more like a native speaker.

How This Grammar Works

Let's dive into the powerful tools for expressing certainty and logic in Korean. First, for expressing that something is logically likely or probable, we use -ㄹ/을 법하다. This structure suggests that based on circumstances, something seems like it could reasonably happen.
For instance, «그는 바빠서 못 올 법해요» (He's busy, so he's likely unable to come). When you're absolutely certain that there's no way something could be true, you'll use -ㄹ 리가 없다. It conveys strong disbelief or a logical impossibility.
For example, «그가 거짓말을 했을 리가 없어요» (There's no way he lied).
To express absolute certainty, when you have no doubt whatsoever, the phrase -ㄹ/을 게 분명하다 is your go-to. It means "it's clear that or it must be. Imagine saying, 내일 비가 올 게 분명해요" (It's definitely going to rain tomorrow). For making a logical past guess, like deducing what must have happened, we use -았/었을 것이다.
This is perfect for speculating about past events you didn't witness but can logically infer. For example, «그는 어제 집에 일찍 갔을 거예요» (He must have gone home early yesterday). Finally, to acknowledge with a 'but', or to concede a point before offering a qualification, we use -기는 하다.
This softens your statement and adds nuance. For instance, «맛있기는 한데, 너무 비싸요» (It is delicious, but it's too expensive). Mastering these B2 Korean grammar structures will significantly enhance your expressive capabilities.

Common Mistakes

  1. 1✗ Wrong: «비 올 것 같아.» (Sounds too casual/simple for strong certainty)
✓ Correct: «비가 올 게 분명해요.» (It's definitely going to rain.)
*Explanation:* While «것 같다» expresses probability, -ㄹ/을 게 분명하다 conveys a much stronger, almost undeniable certainty, which is what the speaker truly intends here.
  1. 1✗ Wrong: «그가 어제 집에 일찍 가야 했어.» (This implies 'had to go,' not 'must have gone' as a deduction)
✓ Correct: «그는 어제 집에 일찍 갔을 거예요.» (He must have gone home early yesterday.)
*Explanation:* -았/었을 것이다 is specifically for logical deduction about past events. «가야 했어» means he *had* to go, indicating obligation, not inference.
  1. 1✗ Wrong: «이 음식은 맛있어. 하지만 비싸.» (A bit blunt, lacks nuance)
✓ Correct: «이 음식은 맛있기는 한데, 너무 비싸요.» (This food is delicious, but it's too expensive.)
*Explanation:* -기는 하다 acknowledges the positive aspect (delicious) first, then gently introduces the negative (expensive), making the statement more polite and nuanced than a direct but.

Real Conversations

A

A

지영 씨가 아직 안 왔네요. (Jiyoung hasn't arrived yet.)
B

B

길이 많이 막히는 걸 보니, 늦을 법해요. (Seeing the heavy traffic, she's likely going to be late.)
A

A

그 어려운 시험에 그가 합격했을까요? (Do you think he passed that difficult exam?)
B

B

그가 밤새 공부한 걸 보면, 합격했을 리가 없어요. (Considering he studied all night, there's no way he didn't pass. / He must have passed.)
A

A

이 프로젝트는 내일까지 끝낼 수 있을까요? (Can we finish this project by tomorrow?)
B

B

팀원들이 열심히 하고 있으니, 분명히 끝낼 수 있을 게 분명해요. (Since the team members are working hard, it's clear we'll be able to finish it.)

Quick FAQ

Q

What's the main difference between -ㄹ/을 법하다 and just using 아마 (probably)?

While 아마 expresses general probability, -ㄹ/을 법하다 specifically implies that something is *logically reasonable* or *plausible* given the circumstances, often based on common sense or observable facts. It adds a layer of reasoned deduction.

Q

Can -았/었을 것이다 be used for future deductions?

No, -았/었을 것이다 is exclusively for logical deductions about *past* events. For future deductions, you would typically use -ㄹ/을 것이다 (e.g., «내일 비가 올 것이다» - It will probably rain tomorrow).

Q

Is -ㄹ 리가 없다 considered informal?

No, -ㄹ 리가 없다 is a versatile expression usable in both formal and informal contexts. Its formality depends more on the politeness level of the ending (e.g., -ㄹ 리가 없어요 vs. -ㄹ 리가 없어).

Q

When is -기는 하다 more appropriate than a simple yes, but...?

-기는 하다 is perfect when you want to acknowledge a point or agree with something, but immediately want to add a caveat, a criticism, or a different perspective. It softens the but and shows you've considered the other side.

Cultural Context

These expressions of certainty and logic are deeply embedded in how native Korean speakers communicate, reflecting a culture that values thoughtful consideration and polite nuance. Using structures like -ㄹ/을 법하다 allows for logical reasoning without sounding overly assertive, while -기는 하다 enables polite disagreement or qualification, crucial in a high-context society. You'll hear these B2 Korean grammar patterns frequently in everyday conversations, news analysis, and even debates, as they allow speakers to express strong opinions with appropriate levels of confidence and deference.
Mastering them will not only improve your grammar but also your cultural understanding.

Ejemplos clave (8)

1

이 시간쯤이면 차가 막힐 법해요.

A esta hora, es probable que haya tráfico.

Suposición Lógica: -ㄹ/을 법하다
2

그 식당은 리뷰가 많아서 맛있을 법해.

Ese restaurante tiene muchas reseñas, así que debería estar rico.

Suposición Lógica: -ㄹ/을 법하다
3

James-ga geu don-eul humchyeoss-eul li-ga eops-eoyo.

No hay forma de que James haya robado ese dinero.

No hay manera de que... (-ㄹ 리가 없다)
4

Beolsseo maejin-il li-ga eopseo! Il-bun-bakk-e an jinatneunde.

¡No puede ser que ya esté agotado! Solo ha pasado un minuto.

No hay manera de que... (-ㄹ 리가 없다)
5

그 영화는 재미있을 게 분명해요.

Estoy seguro de que esa película será divertida.

Expresar certeza absoluta (-ㄹ/을 게 분명하다)
6

그는 벌써 잤을 게 분명해요.

Seguro que ya se durmió.

Expresar certeza absoluta (-ㄹ/을 게 분명하다)
7

어제 비가 많이 `왔을 거예요`. 땅이 다 젖어 있거든요.

Debió haber llovido mucho ayer. El suelo está todo mojado.

Suposición lógica del pasado: 'Debió haber hecho' (-았/었을 것이다)
8

민수 씨는 벌써 `퇴근했을 거예요`. 사무실 불이 꺼져 있어요.

Minsu debió haber salido ya del trabajo. Las luces de la oficina están apagadas.

Suposición lógica del pasado: 'Debió haber hecho' (-았/었을 것이다)

Consejos y trucos (4)

💡

El factor 'Obvio'

Úsalo cuando el resultado es evidente para cualquiera basándose en los hechos. Por ejemplo, si alguien estudió toda la noche: «합격할 법해요.»
frontend.learn_grammar.from_rule: Suposición Lógica: -ㄹ/을 법하다
💬

Modo Drama Queen

Esta frase es un clásico en los K-dramas durante los giros inesperados. A menudo se grita con mucha emoción: «말도 안 돼! 그럴 리가 없어!»
frontend.learn_grammar.from_rule: No hay manera de que... (-ㄹ 리가 없다)
🎯

El '게' es la clave

Recuerda que '게' es simplemente '것이' con ropa casual. Usar '게' te hará sonar súper natural y fluido en una charla, por ejemplo: «맛있을 게 분명해요.»
frontend.learn_grammar.from_rule: Expresar certeza absoluta (-ㄹ/을 게 분명하다)
🎯

La regla de la evidencia

Busca siempre una pista visual o lógica antes de usar esta forma. Si el suelo está mojado, di: «비가 왔을 거예요.»
frontend.learn_grammar.from_rule: Suposición lógica del pasado: 'Debió haber hecho' (-았/었을 것이다)

Vocabulario clave (6)

분명하다 to be clear/certain 이유 reason 교통 체증 traffic jam 인정하다 to admit/acknowledge 가능성 possibility 확실히 certainly/definitely

Real-World Preview

clock

The Late Friend

Review Summary

  • V/A + -ㄹ/을 법하다
  • V/A + -ㄹ/을 리가 없다
  • V/A + -았/었을 것이다

Errores comunes

The pattern is almost exclusively used with '없다' to show impossibility. Using '있다' makes it a rhetorical question which is much rarer.

Wrong: 그가 올 리가 있어요? (Is there a way he's coming?)
Correcto: 그가 올 리가 없어요. (There's no way he's coming.)

In spoken Korean, -ㄹ 것이에요 is almost always contracted to -ㄹ 거예요. Using the uncontracted form sounds overly stiff.

Wrong: 어제 갔을 것이에요.
Correcto: 어제 갔을 거예요.

-기는 하다 feels incomplete without a contrasting clause (하지만/한데). It is used to concede a point before adding a 'but'.

Wrong: 그는 똑똑하기는 해요. (He is smart.)
Correcto: 그는 똑똑하기는 하지만 공부는 안 해요. (He is smart, but he doesn't study.)

Next Steps

You've just added a layer of sophistication to your Korean that many learners never reach. You are now capable of debating and reasoning like a true B2 speaker!

Watch a Korean mystery drama and narrate your theories using -ㄹ 게 분명해요.

Write 5 sentences about your childhood using -았/었을 것이다 for things you don't remember clearly.

Continue to: Inevitability and Close Calls

Práctica rápida (10)

Encuentra y corrige el error en la forma corta.

한국어가 어렵긴은 하지만 재미있어요.

✓ Correct! ✗ Not quite. Correct answer: Ambas son correctas.
'-긴' es la contracción de '-기는', pero no puedes usar ambos juntos como '긴은'. Usa uno u otro.

frontend.learn_grammar.from_rule: Admitir con un 'Pero' (-기는 하다)

Encuentra el error en esta suposición: '그는 어제 밥을 먹을 거예요.'

그는 어제 밥을 먹을 거예요.

✓ Correct! ✗ Not quite. Correct answer: 그는 어제 밥을 먹었을 거예요.
Como sucedió '어제' (ayer), debes usar el marcador de pasado '-었-' antes de la terminación.

frontend.learn_grammar.from_rule: Suposición lógica del pasado: 'Debió haber hecho' (-았/었을 것이다)

Rellena el espacio para expresar 'Me gusta, pero...'

피자를 좋아___ 한데 너무 비싸요.

✓ Correct! ✗ Not quite. Correct answer: 기는
Para admitir que algo te gusta pero tienes una reserva, usa el patrón '-기는'.

frontend.learn_grammar.from_rule: Admitir con un 'Pero' (-기는 하다)

¿Qué oración dice correctamente 'Debió haber hecho calor'?

Elige la oración correcta:

✓ Correct! ✗ Not quite. Correct answer: 더웠을 거예요.
'더웠을 거예요' es la conjetura pasada para el adjetivo '덥다' (calor).

frontend.learn_grammar.from_rule: Suposición lógica del pasado: 'Debió haber hecho' (-았/었을 것이다)

¿Qué frase usa correctamente el patrón de concesión?

Elige la frase más natural para 'Es barato, pero no es bueno':

✓ Correct! ✗ Not quite. Correct answer: 싸기는 한데 좋지 않아요.
La raíz del adjetivo '싸-' + '-기는' + '한데' es la forma correcta de conectar ambos pensamientos.

frontend.learn_grammar.from_rule: Admitir con un 'Pero' (-기는 하다)

Encuentra el error en la frase.

Find and fix the mistake:

그 사람은 한국 사람일 게 분명하다요.

✓ Correct! ✗ Not quite. Correct answer: 그 사람은 한국 사람일 게 분명해요.
La terminación cortés para 분명하다 es 분명해요, no 분명하다요.

frontend.learn_grammar.from_rule: Expresar certeza absoluta (-ㄹ/을 게 분명하다)

Completa la frase usando 'saber' (알다).

Él acaba de llegar ayer. ¡___ ___ ___ ___ el código secreto! (No hay forma de que sepa)

✓ Correct! ✗ Not quite. Correct answer: 알 리가 없어
Usamos '알 리가 없어' (raíz 알 + 리가 없다) para expresar que es imposible que él tenga esa información.

frontend.learn_grammar.from_rule: No hay manera de que... (-ㄹ 리가 없다)

Completa la frase: 'Es una historia que parece creíble'.

그것은 그럴 ___ 이야기예요.

✓ Correct! ✗ Not quite. Correct answer: 법한
그럴 법하다 significa 'ser plausible o probable'.

frontend.learn_grammar.from_rule: Suposición Lógica: -ㄹ/을 법하다

¿Cuál encaja mejor para: 'Como practicó tanto, tiene sentido que gane'?

연습을 많이 했으니 ___.

✓ Correct! ✗ Not quite. Correct answer: 이길 법해요
Aunque '이길 것 같아요' funciona, '이길 법해요' enfatiza la LÓGICA del esfuerzo previo.

frontend.learn_grammar.from_rule: Suposición Lógica: -ㄹ/을 법하다

Corrige el espaciado estándar.

Find and fix the mistake:

그는성공할법하다.

✓ Correct! ✗ Not quite. Correct answer: 그는 성공할 법하다.
El espaciado estándar va entre el modificador 성공할 y 법하다.

frontend.learn_grammar.from_rule: Suposición Lógica: -ㄹ/을 법하다

Score: /10

Preguntas frecuentes (6)

¡Claro! Usa la forma -었/았을 법하다. Significa 'es probable que haya pasado algo' basándote en pruebas actuales: «그랬을 법해요.»
그럴 법하다 se basa en la validez lógica. 그럴 듯하다 implica que algo 'parece' creíble, pero a veces sugiere que es solo una apariencia superficial: «그럴 듯한 핑계» (una excusa convincente).
'리' viene del Hanja 理 (razón/lógica). Lo ves en palabras como 이해 (comprensión). Básicamente dices 'la lógica no existe': «그럴 리가 없지.»
¡Sí! Por ejemplo: «내가 그럴 리가 없어» (No hay forma de que yo haya hecho eso). Úsalo si te acusan de algo que jamás harías.
-ㄹ 것이다 es un futuro general o una suposición simple. -ㄹ 게 분명하다 añade una capa pesada de 'certeza' basada en evidencia. Es la diferencia entre 'iré' y 'estoy SEGURO de que iré' (visto por un observador) como en «그는 갈 게 분명해요».
¡Sí! Usa -았/었을 게 분명하다. Por ejemplo: «그는 이미 밥을 먹었을 게 분명해요» (Seguro que ya comió).
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