Table of Contents

1. Introduction
2. Understanding ‘-고 나서’
3. Understanding ‘-(으)ㄹ 테니까’
4. Practical Usage
5. Common Mistakes
6. Advanced Applications
7. Summary

1. Introduction

These two grammar patterns are essential for expressing sequence of actions and reasoning in Korean. Let’s explore their uses and nuances in detail.

2. Understanding ‘-고 나서’

Basic Function

‘-고 나서’ indicates:

• Completion of one action before another begins
• Sequential actions
• “After doing something”

Formation Rules

1. Verb + -고 나서

먹다 → 먹고 나서
(meokko naseo)
Pronunciation: [məkːo nasə]

2. Action Completion

공부하다 → 공부하고 나서
(gongbuhago naseo)
Pronunciation: [koŋbuhago nasə]

Common Usage Patterns

1. Daily Activities

샤워하고 나서 잠을 잤어요
(syawoehago naseo jameul jasseoyo)
"I slept after taking a shower"
Pronunciation: [ʃawehago nasə tamɯl tʃasːəjo]

2. Sequential Events

식사하고 나서 운동할 거예요
(siksahago naseo undonghal geoyeyo)
"I will exercise after eating"
Pronunciation: [sikʰsahago nasə undoŋhal kəjejo]

3. Understanding ‘-(으)ㄹ 테니까’

Basic Function

‘-(으)ㄹ 테니까’ expresses:

• Reasoning for future actions
• Cause and effect relationships
• “Because (I/someone) will…”

Formation Rules

1. Verb Stem + -(으)ㄹ 테니까

가다 → 갈 테니까
(gal tenikka)
Pronunciation: [kal tʰenikːa]

2. With Consonant Endings

읽다 → 읽을 테니까
(ilgeul tenikka)
Pronunciation: [ilgɯl tʰenikːa]

Common Usage Patterns

1. Making Plans

내가 할 테니까 걱정하지 마세요
(naega hal tenikka geokjeonghaji maseyo)
"Don't worry because I will do it"

2. Giving Reasons

비가 올 테니까 우산을 가져가세요
(biga ol tenikka usaneul gajyeogaseyo)
"Take an umbrella because it will rain"

4. Practical Usage

‘-고 나서’ in Daily Life

1. Morning Routine

아침을 먹고 나서 출근해요
(achimeul meokko naseo chulgeunhaeyo)
"I go to work after eating breakfast"

2. Study Schedule

숙제하고 나서 게임할 거예요
(sukjehago naseo geimhal geoyeyo)
"I will play games after doing homework"

‘-(으)ㄹ 테니까’ in Various Situations

1. Making Promises

제가 전화할 테니까 기다리세요
(jega jeonhwahal tenikka gidariseyo)
"Wait because I will call you"

2. Giving Instructions

길이 막힐 테니까 일찍 출발해요
(giri makhil tenikka iljjik chulbalhaeyo)
"Leave early because the road will be congested"

5. Common Mistakes

Mistakes with ‘-고 나서’

1. Wrong Order

• Incorrect: 나서 공부하고 잠을 잤어요
• Correct: 공부하고 나서 잠을 잤어요

1. Tense Issues

• Incorrect: 먹었고 나서
• Correct: 먹고 나서

Mistakes with ‘-(으)ㄹ 테니까’

1. Present Tense Usage

• Incorrect: 하는 테니까
• Correct: 할 테니까

1. Past Tense Errors

• Incorrect: 했을 테니까
• Correct: 할 테니까

6. Advanced Applications

Combining Both Patterns

1. Complex Sentences

숙제하고 나서 놀 테니까 걱정하지 마세요
(sukjehago naseo nol tenikka geokjeonghaji maseyo)
"Don't worry because I will play after doing homework"

2. Multiple Actions

청소하고 나서 요리할 테니까 기다려주세요
(cheongsohago naseo yorihal tenikka gidaryeojuseyo)
"Please wait because I will cook after cleaning"

Formal Usage

1. Business Context

회의하고 나서 보고할 테니까 준비해 주세요
(hoeuihago naseo bogohal tenikka junbihae juseyo)
"Please prepare because I will report after the meeting"

2. Academic Settings

발표하고 나서 질문 받을 테니까 준비하세요
(balpyohago naseo jilmun badeul tenikka junbihaseyo)
"Prepare because we will take questions after the presentation"

7. Practice Exercises

Exercise 1: ‘-고 나서’

Complete these sentences:

1. 운동하다 → ____ 샤워해요
2. 공부하다 → ____ 쉴 거예요

Exercise 2: ‘-(으)ㄹ 테니까’

Transform these sentences:

1. 도착하다 → ____ 기다리세요
2. 설명하다 → ____ 잘 들으세요

8. Contextual Usage

Social Situations

1. With Friends

영화 보고 나서 커피 마실까요?
(yeonghwa bogo naseo keopi masilkkayo?)
"Shall we have coffee after watching the movie?"

2. Making Plans

제가 연락할 테니까 핸드폰 확인해 주세요
(jega yeonrakhal tenikka haendeupon hwaginhae juseyo)
"Please check your phone because I will contact you"

Professional Context

1. Office Environment

미팅하고 나서 결과를 알려드릴 테니까 기다려 주세요
(mitinghago naseo gyeolgwareul allyeodeuril tenikka gidaryeo juseyo)
"Please wait because I will inform you of the results after the meeting"

2. Customer Service

확인하고 나서 답변 드릴 테니까 잠시만 기다려 주세요
(hwaginhago naseo dapbyeon deuril tenikka jamssiman gidaryeo juseyo)
"Please wait a moment because I will reply after checking"

9. Cultural Notes

Polite Usage

1. Showing Consideration

제가 처리하고 나서 말씀드릴 테니까 걱정하지 마세요
(jega cheorihago naseo malsseumdeuril tenikka geokjeonghaji maseyo)
"Don't worry because I will tell you after I handle it"

2. Group Harmony

다 같이 식사하고 나서 시작할 테니까 기다려주세요
(da gachi siksahago naseo sijakhal tenikka gidaryeojuseyo)
"Please wait because we will start after everyone eats together"

10. Summary

Key Points for ‘-고 나서’

1. Indicates sequence of actions
2. Shows completion before next action
3. Used for clear time progression

Key Points for ‘-(으)ㄹ 테니까’

1. Expresses future reasoning
2. Shows cause and effect
3. Used for making promises or explaining plans

Conclusion

Both grammar patterns are essential for expressing sequence and reasoning in Korean:

• Use ‘-고 나서’ for clear sequential actions
• Use ‘-(으)ㄹ 테니까’ for explaining future-based reasoning
• Combine both for more complex expressions

Practice these patterns regularly in various contexts to master their usage naturally.