Before and After in Korean: 전에 and 후에

In Brief

Use verb stem + 기 전에 for “before doing” and verb stem + (으)ㄴ 후에 for “after doing”: 먹기 전에 means “before eating,” while 먹은 후에 means “after eating.” If a noun already names an event or time, add 전에 or 후에 directly: 수업 전에 (“before class”) and 수업 후에 (“after class”).

Overview

Korean uses 전에 and 후에 to place one action or event earlier or later than another. These expressions are useful for routines, plans, instructions, and stories: washing your hands before a meal, calling someone after work, or meeting after class. They normally come before the main clause because Korean places the final action at the end of the sentence.

At A2, the essential contrast is straightforward. Before an action, use -기 전에. After a completed action, use -(으)ㄴ 후에. A verb stem is the dictionary form without -다: the stem of 먹다 (“to eat”) is 먹-. With event nouns such as 수업 (“class”) and 회의 (“meeting”), no verb ending is needed.

The two verb patterns are not mirror images. -기 is a nominalizer (an ending that makes an action behave like a noun), whereas -(으)ㄴ is a noun-modifying form (a verb form placed before a noun to describe it). This difference explains why Korean says 먹기 전에 but 먹은 후에, not forms made by simply swapping “before” and “after.”

How It Works

The core patterns

Relationship	Pattern	Korean phrase	Meaning
action before another action	verb stem + 기 전에	자기 전에	before sleeping
completed action before another action	verb stem + (으)ㄴ 후에	잔 후에	after sleeping
before an event or time noun	noun + 전에	수업 전에	before class
after an event or time noun	noun + 후에	수업 후에	after class

Both 전 and 후 are nouns: 전 refers to an earlier time and 후 to a later time. 에 is a particle (a short grammatical marker attached to a word) used here to mark a time. Learn 전에 and 후에 as complete time expressions at first.

Before an action: -기 전에

Remove -다 from the dictionary form and add -기 전에. The form is the same whether the stem ends in a vowel or a consonant.

Dictionary form	Stem	Form	Meaning
먹다	먹-	먹기 전에	before eating
가다	가-	가기 전에	before going
자다	자-	자기 전에	before sleeping
운동하다	운동하-	운동하기 전에	before exercising
만들다	만들-	만들기 전에	before making

The tense belongs on the final verb, not normally inside -기 전에:

• 자기 전에 샤워해요. — I shower before going to bed.
• 자기 전에 샤워했어요. — I showered before going to bed.
• 자기 전에 샤워할 거예요. — I will shower before going to bed.

In each sentence, 자기 전에 remains unchanged. English speakers may want to match “before I went” with a Korean past marker, but the basic Korean pattern expresses the sequence without doing that.

After an action: -(으)ㄴ 후에

Remove -다, make the completed noun-modifying form, and add 후에.

Stem ending	Rule	Dictionary form	Result
consonant other than ㄹ	add -은	먹다	먹은 후에
vowel	add -ㄴ	가다	간 후에
ㄹ	drop ㄹ and add -ㄴ	만들다	만든 후에
하다	becomes 한	공부하다	공부한 후에

The -(으)ㄴ form presents the first action as completed before the next one begins. It does not by itself force the whole sentence into the past:

• 저녁을 먹은 후에 산책했어요. — I took a walk after dinner.
• 저녁을 먹은 후에 산책할 거예요. — I will take a walk after dinner.

In the second sentence, dinner and the walk are both future events. 먹은 marks dinner as completed relative to the later walk, while 할 거예요 places the overall plan in the future.

A few common irregular verbs change as they do in other -(으)ㄴ forms:

Dictionary form	After-form	Meaning
듣다	들은 후에	after listening
돕다	도운 후에	after helping
짓다	지은 후에	after building/writing
살다	산 후에	after living

These are stem changes, not exceptions unique to 후에. If you have not studied irregular verb patterns yet, memorize the forms you meet rather than trying to learn every class at once.

With nouns: noun + 전에/후에

When a noun itself names an event, activity, or reference time, attach 전에 or 후에 directly.

Noun	Before	After
수업 (class)	수업 전에	수업 후에
회의 (meeting)	회의 전에	회의 후에
식사 (meal)	식사 전에	식사 후에
퇴근 (leaving work)	퇴근 전에	퇴근 후에

Some 하다 activities can therefore appear in two closely related forms: 운동 전에 (“before exercise”) and 운동하기 전에 (“before exercising”). The noun form is compact; the verb form more explicitly presents the activity as an action.

Do not insert 에 between the noun and 전/후. Say 수업 전에, not 수업에 전에. In careful spelling, 수업 전 and 수업 후 are written with a space because 전 and 후 are separate nouns; the particle then attaches to them: 수업 전에, 수업 후에.

Building the whole sentence

The usual order is:

earlier/later-time expression + main clause

• 출근하기 전에 커피를 마셔요.
• before going to work + coffee + drink
• “I drink coffee before going to work.”

Korean often leaves out a subject when context makes it clear. If the two actions have different subjects, state them where needed:

• 제가 나가기 전에 친구가 왔어요. — My friend came before I left.

Here 제가 belongs to 나가기 전에, while 친구가 is the subject of 왔어요. English word order cannot reliably tell you where Korean subjects should go, so read each clause around its own verb.

Examples in Context

Korean	English	Note
먹기 전에 손을 씻어요.	Wash your hands before eating.	-기 전에 with a consonant-ending stem
자기 전에 책을 읽어요.	I read a book before going to sleep.	A regular daily routine
집을 나가기 전에 창문을 닫았어요.	I closed the window before leaving home.	The final verb carries past tense
여행하기 전에 호텔을 예약할 거예요.	I’ll book a hotel before traveling.	The final verb makes the plan future
영화가 시작하기 전에 자리에 앉으세요.	Please sit down before the movie starts.	A stated subject in the first clause
밥을 먹은 후에 약을 드세요.	Please take the medicine after eating.	The first action must be completed
숙제를 끝낸 후에 게임을 했어요.	I played a game after finishing my homework.	Vowel-ending stem: 끝내다 → 끝낸
한국어를 들은 후에 따라 말해 보세요.	After listening to the Korean, try repeating it.	Irregular 듣다 → 들은
서울에 간 후에 친구에게 연락할 거예요.	I’ll contact my friend after going to Seoul.	Future plan with 간 후에
운동한 후에 물을 많이 마셔요.	I drink plenty of water after exercising.	하다 → 한
수업 전에 단어를 복습해요.	I review vocabulary before class.	Noun + 전에
수업 후에 만나요.	Let’s meet after class.	Noun + 후에
회의 전에 자료를 보내 주세요.	Please send the materials before the meeting.	Compact event-noun pattern
퇴근 후에 장을 볼 거예요.	I’m going grocery shopping after work.	Common everyday noun expression
제가 도착하기 전에 비가 그쳤어요.	The rain stopped before I arrived.	The two clauses have different subjects

Common Mistakes

Using -기 후에

• Wrong: 먹기 후에 나갔어요.
• Right: 먹은 후에 나갔어요.
• Why: The basic “after doing” pattern uses the completed modifier -(으)ㄴ before 후에. Reserve -기 전에 for “before doing.”

Using -(으)ㄴ 전에 for the basic “before doing” pattern

• Wrong: 먹은 전에 손을 씻어요.
• Right: 먹기 전에 손을 씻어요.
• Why: Before an action, attach -기 전에 to the stem. 먹은 is a noun-modifying form, but this sentence has no noun between 먹은 and 전에 that it can naturally modify.

Treating -(으)ㄴ as ordinary past tense

• Wrong idea: 먹은 후에 갈 거예요 cannot be future because 먹은 looks past.
• Right interpretation: 먹은 후에 갈 거예요. = “I’ll go after eating.”
• Why: -(으)ㄴ marks the eating as completed before the going. The final predicate 갈 거예요 sets the sentence in the future.

Forgetting the ㄹ-stem change

• Wrong: 만들은 후에, 살은 후에
• Right: 만든 후에, 산 후에
• Why: A stem-final ㄹ drops before -ㄴ: 만들- → 만든, 살- → 산.

Adding an extra particle after a noun

• Wrong: 수업에 전에 만나요.
• Right: 수업 전에 만나요.
• Why: Attach the time expression directly to the noun: noun + 전/후 + 에.

Copying English clause order

• Awkward: 손을 씻어요 먹기 전에.
• Natural: 먹기 전에 손을 씻어요.
• Why: Korean normally places the time clause before the main action and leaves the final predicate at the end.

Usage Notes

후에, 뒤에, and 다음에

후에 is neutral and common in both speech and writing. 뒤에 can also mean “after” and is very common in conversation: 밥을 먹은 뒤에 나갔어요 has essentially the same sequence as 밥을 먹은 후에 나갔어요. Since 뒤 also means “behind,” context determines whether it refers to space or time.

다음에 means “next time” or “after/next,” depending on the construction. 수업 후에 specifically means “after class,” while 다음 수업에 means “at the next class.” Do not assume every English use of “after” maps to 후에.

에 is sometimes omitted

You may see headings, schedules, instructions, and compact written phrases such as 식사 후 복용 (“take after meals”) or 회의 후 연락 (“contact [someone] after the meeting”). Here 후 appears without 에. In a complete beginner sentence, 후에 is a safe default: 식사 후에 약을 드세요.

The same omission can occur with 전: 출발 전 확인 means “check before departure.” This compact style is especially common on notices, labels, calendars, and lists.

“Ago” with 전에

A duration followed by 전에 usually means “ago,” not “before doing”:

• 두 시간 전에 도착했어요. — I arrived two hours ago.
• 삼 년 전에 한국어 공부를 시작했어요. — I started studying Korean three years ago.

Compare 수업 전에 (“before class”) with 두 시간 전에 (“two hours ago”). The grammar looks similar, but a measured duration supplies the distance back from the present or another reference point.

Politeness comes at the end

Neither -기 전에 nor -(으)ㄴ 후에 is polite or casual by itself. Speech level appears on the final predicate:

• 먹기 전에 씻어. — Wash [it] before eating. (casual)
• 먹기 전에 씻어요. — Wash [it] before eating. (polite)
• 먹기 전에 씻으세요. — Please wash [it] before eating. (polite request)

This is a useful Korean habit: build the sequence first, then choose the ending that fits the relationship and situation.

Beyond the Basics / Advanced Use

You do not need to master the following points at A2, but they explain forms you will encounter later.

Different subjects and ambiguity

When no subjects are stated, listeners usually infer that one person performs both actions:

• 밥을 먹은 후에 나갔어요. — I/he/she went out after eating.

If different people act, explicit subjects prevent confusion:

• 민수가 밥을 먹은 후에 제가 설거지했어요. — After Minsu ate, I washed the dishes.

The first subject belongs inside the time clause; the second belongs to the main clause. In formal or complex writing, this distinction matters more than it does in a simple conversation with clear context.

전부터 and 후부터

Adding 부터 (“from, starting at”) changes the focus from a boundary to a starting point:

• 수업 전부터 기다렸어요. — I had been waiting since before class.
• 그날 후부터 매일 운동했어요. — From after that day onward, I exercised every day.

These are related expressions, but they do not simply mean “before” and “after.” They emphasize when an ongoing state or habit starts.

More formal alternatives

Formal notices and writing may use -기 전 and -(으)ㄴ 후 without 에, especially when another particle follows or when the expression modifies a noun:

• 신청하기 전 확인 사항 — points to check before applying
• 검사가 끝난 후의 절차 — the procedure after the examination

In the second phrase, 후의 uses 의 to connect “after” to 절차 (“procedure”). These compressed noun phrases are useful for reading official information, but full 전에/후에 sentences remain more natural for an A2 learner to produce.

Sequence versus immediate sequence

-(으)ㄴ 후에 only states that one action follows another; it does not say how quickly. If immediacy matters, Korean can add an expression such as 바로 (“right away”):

• 도착한 후에 바로 전화했어요. — I called immediately after arriving.

Later you may also meet -자마자, which means “as soon as.” Compare 도착한 후에 전화했어요 (“I called after arriving”) with 도착하자마자 전화했어요 (“I called as soon as I arrived”).

Practice Tips

1. Pair one verb in both directions. Make pairs such as 먹기 전에 / 먹은 후에, 가기 전에 / 간 후에, and 공부하기 전에 / 공부한 후에. This prevents the common mistake of using -기 for both patterns.
2. Describe a real routine. Write five sentences about your morning or evening: what you do before breakfast, after showering, before work, and after class. Put tense and politeness only on the final verb.
3. Sort nouns from verbs. On one side, collect event nouns such as 수업, 회의, 식사 and attach 전에/후에 directly. On the other, collect dictionary-form verbs and practice the required -기 or -(으)ㄴ form.

Related Concepts

• Prerequisite: Polite Ending -아/어요 — use polite endings on the final verb when describing routines, plans, and sequences.