Common Mistake

How to Say “Before” and “After” in Korean: 전에, 후에, and -고 나서

Learn the natural difference between 전에, 후에, and -고 나서—and why 일 후에 sounds awkward for “after work.”

Today, one of my students wanted to say:

“After work, I went to the library.”

She said:

❌ 일 후에 도서관에 갔어요.

I understood what she meant, but it didn’t sound natural in Korean.

Here are some better options:

✅ 일이 끝난 후에 도서관에 갔어요.After I finished work, I went to the library.
✅ 퇴근 후에 도서관에 갔어요.After work, I went to the library.
✅ 일 끝나고 도서관에 갔어요.I went to the library after work.

Why does 일 후에 sound unnatural, even though nouns can come before 후에?

Let’s look at how Koreans express “after” and “before.”

How to Say “After” in Korean

Noun + 후에

Add 후에 after a noun that represents an event or time.

  • 수업 후에 = after class
  • 점심 후에 = after lunch
  • 퇴근 후에 = after work
  • 일주일 후에 = one week later

Although 일 can mean “work,” Koreans don’t normally use 일 후에 to mean “after work.” We usually say 퇴근 후에 or describe the action of finishing work.

Verb + -(으)ㄴ 후에

When 후에 follows a verb, the verb must be changed into the -(으)ㄴ form.

If the verb stem ends in a consonant, add -은 후에:

  • 먹다 → 먹은 후에 = after eating
  • 읽다 → 읽은 후에 = after reading
  • 씻다 → 씻은 후에 = after washing

If the verb stem ends in a vowel, add -ㄴ 후에:

  • 보다 → 본 후에 = after seeing
  • 배우다 → 배운 후에 = after learning

If the verb stem ends in ㄹ, remove ㄹ and add -ㄴ 후에:

  • 놀다 → 논 후에 = after playing
  • 만들다 → 만든 후에 = after making

How to Say “Before” in Korean

Noun + 전에

Add 전에 directly after a noun:

  • 수업 전에 = before class
  • 점심 전에 = before lunch
  • 퇴근 전에 = before leaving work

Verb + -기 전에

With a verb, simply add -기 전에 to the verb stem:

  • 먹다 → 먹기 전에 = before eating
  • 가다 → 가기 전에 = before going
  • 씻다 → 씻기 전에 = before washing
  • 공부하다 → 공부하기 전에 = before studying

A Quick Quiz

Rachel says:

저는 매일 아침 이를 닦은 후에 세수해요.Every morning, I wash my face after brushing my teeth.

What does she do first?

  • 1. She brushes her teeth.
  • 2. She washes her face.

The answer is 1 → 2!

First, she brushes her teeth. After that, she washes her face.

How Koreans Actually Speak

-(으)ㄴ 후에 is grammatically correct and common in written or careful Korean. In everyday conversation, however, Koreans often use -고 나서.

Compare these sentences:

밥을 먹은 후에 이를 닦아요.I brush my teeth after eating. Neutral and slightly more textbook-like.
밥 먹고 나서 이 닦아요.I brush my teeth after eating. Natural in everyday conversation.

When the order is already clear, Koreans may simply use -고:

밥 먹고 이 닦아요.I eat and then brush my teeth.

Now let’s return to my student’s sentence.

일이 끝난 후에 도서관에 갔어요.Grammatically correct and neutral.
일 끝나고 나서 도서관에 갔어요.Natural in conversation.
일 끝나고 도서관 갔어요.Very natural in casual conversation.

Quick Summary

After doing something

  • Noun + 후에
  • Verb + -(으)ㄴ 후에
  • Verb + -고 나서 in everyday conversation

Before doing something

  • Noun + 전에
  • Verb + -기 전에

Now you know not only how to use 후에 and 전에, but also how to express these ideas more naturally in everyday Korean!

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