Connecting with -고 in Korean

In Brief

Attach -고 directly to a verb or descriptive-verb stem to connect it to another predicate: 먹다 → 먹고, “eat and …”; 크다 → 크고, “be big and ….” In the basic pattern, tense and politeness are shown on the final predicate, while -고 itself does not change.

Overview

-고 is one of Korean’s most useful connective endings. A connective ending is a piece added to a predicate stem to link one clause to the next. It often corresponds to English and, and in a sequence of actions it may sound like and then: 밥을 먹고 학교에 가요 means “I eat and go to school.”

It works with both action verbs, such as 먹다 “to eat,” and descriptive verbs, such as 크다 “to be big.” Korean descriptive verbs do much of the work that “be + adjective” does in English. This lets -고 join actions, qualities, states, identities, and even several items in a longer list.

This is an A1 pattern because its basic formation is very regular. The important shift for an English-speaking learner is that Korean does not normally place a complete polite verb form before “and.” Instead, the first predicate takes -고, and the last predicate carries the sentence’s tense, politeness, and sentence type.

How It Works

Basic formation: stem + -고

Start with the dictionary form, remove -다 to find the stem, and add -고. The same ending follows both vowel-final and consonant-final stems; there is no choice between two shapes.

Dictionary form	Stem	Connected form	Meaning
가다	가-	가고	go and …
먹다	먹-	먹고	eat and …
읽다	읽-	읽고	read and …
하다	하-	하고	do and …
크다	크-	크고	be big and …
재미있다	재미있-	재미있고	be interesting and …

Unlike many Korean endings, -고 does not depend on whether the stem ends in a vowel or consonant. It also does not trigger the 아/어 contractions seen in forms such as 가요 or 해요: 하다 simply becomes 하고, not 해고.

The final predicate finishes the sentence

A predicate is the verb or descriptive verb that says what happens or what something is like. In a basic A-고 B sentence, A is connected and B completes the sentence:

subject/topic + A stem-고 + B with final ending

• 민수는 커피를 마시고 일해요. — Minsu drinks coffee and works.
• 방이 넓고 조용해요. — The room is spacious and quiet.

The last predicate shows whether the whole sentence is polite, casual, a question, a command, or in the past. Compare:

Sentence	What the final form shows
먹고 가요.	polite present statement: eat and go
먹고 갔어요.	polite past statement: ate and went
먹고 가세요.	polite request/command: eat and go
먹고 갈까요?	suggestion/question: shall we eat and go?

For beginners, the safest rule is: use the plain stem + -고 in the first clause, and put tense and speech level on the last predicate. Thus 친구를 만나고 영화를 봤어요 naturally reports a completed series: “I met a friend and watched a movie.”

Actions, descriptions, and identities

With action verbs, -고 can list actions or present them as a sequence:

• 문을 열고 들어가요. — Open the door and go in.
• 아침을 먹고 출근했어요. — I ate breakfast and went to work.

With descriptive verbs, it usually adds qualities without implying a time sequence:

• 이 가방은 가볍고 편해요. — This bag is light and comfortable.
• 그 식당은 작고 조용해요. — That restaurant is small and quiet.

It can also follow 이다 “to be” in the form 이고 after a noun:

• 저는 학생이고 동생은 회사원이에요. — I am a student, and my younger sibling is an office worker.
• 오늘은 월요일이고 휴일이에요. — Today is Monday and a holiday.

Subjects may stay the same or change

The subject (the person or thing the clause is about) is often shared and omitted when context makes it clear:

• 저는 샤워하고 잤어요. — I showered and slept.

However, -고 does not require both clauses to have the same subject:

• 저는 요리하고 친구는 설거지해요. — I cook, and my friend washes the dishes.

State both subjects when omitting one would cause confusion. This freedom becomes important when you later compare -고 with -(으)면서, which normally links simultaneous actions by the same subject.

More than two connected predicates

You can repeat -고 to build a list. Only the final item needs the sentence-final ending:

• 아침에 일어나고, 씻고, 커피를 마셔요. — In the morning I get up, wash, and drink coffee.
• 이 도시는 깨끗하고 안전하고 교통도 편리해요. — This city is clean and safe, and its transportation is convenient too.

Long chains can become hard to follow. In speech, pauses help; in writing, commas may mark the groups, but the grammar does not depend on the comma.

Examples in Context

Korean	English	Note
밥을 먹고 학교에 가요.	I eat and go to school.	A natural sequence of actions
크고 비싸요.	It is big and expensive.	Two descriptions; no sequence
앉고 기다리세요.	Please sit and wait.	The request ending appears only at the end
친구를 만나고 영화를 봤어요.	I met a friend and watched a movie.	The final verb marks the past
문을 닫고 불을 꺼 주세요.	Please close the door and turn off the light.	Two requested actions
주말에는 청소하고 빨래해요.	On weekends, I clean and do laundry.	Repeated routine
이 카페는 조용하고 커피가 맛있어요.	This café is quiet, and its coffee is good.	Different subjects in the two clauses
언니는 의사이고 오빠는 선생님이에요.	My older sister is a doctor, and my older brother is a teacher.	Noun + 이다 becomes 이고
지하철을 타고 회사에 갔어요.	I took the subway and went to work.	Often understood as “by taking the subway”
이름을 쓰고 여기에 서명하세요.	Write your name and sign here.	Ordered instructions
어제는 춥고 바람도 많이 불었어요.	Yesterday it was cold, and it was also very windy.	Related weather descriptions
음악을 듣고 책을 읽었어요.	I listened to music and read a book.	The actions may be sequential; simultaneity is not explicit
시장에 가고, 채소를 사고, 집에 돌아왔어요.	I went to the market, bought vegetables, and came home.	A three-event narrative

Common Mistakes

Adding -고 to the complete polite form

• Wrong: 먹어요고 가요.
• Right: 먹고 가요.
• Why: Remove -다 from 먹다 and attach -고 to 먹-. The connected predicate does not take -아요/어요 first.

Changing -고 according to the stem

• Wrong: 가으고, 먹으고
• Right: 가고, 먹고
• Why: -고 has one basic shape after both vowels and consonants. Do not add 으.

Marking tense on every verb in a simple sequence

• Awkward for the basic intended pattern: 친구를 만났고 영화를 봤어요.
• Basic correction: 친구를 만나고 영화를 봤어요.
• Why: In a straightforward past sequence, the final 봤어요 can place both events in the past. 만났고 is grammatical in other contexts, especially when presenting “met” as an independently past fact, but beginners do not need it for an ordinary sequence.

Assuming -고 always means “and then”

• Misleading reading: 방이 넓고 밝아요 = “The room is spacious, and then bright.”
• Right reading: 방이 넓고 밝아요. — The room is spacious and bright.
• Why: With descriptions, -고 simply adds information. Even between actions, it can list events without strongly emphasizing their exact timing.

Using -고 when “while” is essential

• Unclear for simultaneity: 음악을 듣고 공부해요.
• Clear simultaneous meaning: 음악을 들으면서 공부해요. — I study while listening to music.
• Why: -고 may be understood as “listen to music and study,” perhaps one after the other. Use -(으)면서 when simultaneous action is the point.

Negating only the final predicate by accident

• Different meaning: 커피를 마시고 밥을 안 먹었어요. — I drank coffee and did not eat.
• If both are negative: 커피도 안 마시고 밥도 안 먹었어요. — I neither drank coffee nor ate.
• Why: Negation belongs to the predicate it appears with. A final 안 does not automatically negate every earlier -고 clause.

Usage Notes

“And” is a guide, not a one-to-one translation

English repeatedly uses “and,” but Korean chooses among several connectors according to the relationship between ideas. -고 is neutral and additive. Context may make it sound like “and,” “and then,” or occasionally “by doing.” For example, 버스를 타고 갔어요 is literally organized as “took a bus and went,” but natural English is often “I went by bus.”

Do not assume that -고 itself expresses cause. 비가 오고 집에 있었어요 lists “it rained” and “I stayed home”; it does not clearly say that rain caused the decision. Korean has other endings when “because” is the intended relationship.

Order usually follows the event order—but not always

When two deliberate actions form a natural sequence, Korean commonly states them in chronological order: 표를 사고 들어갔어요 “I bought a ticket and went in.” Reversing them would suggest a different sequence or sound illogical.

With descriptions and independent facts, order is usually a matter of emphasis rather than time: 싸고 좋아요 and 좋고 싸요 both praise something, but lead with different information.

Speech level appears at the end

In a chain such as 먹고 쉬고 자요, the final -요 makes the whole utterance politely informal. Formal -습니다, casual endings, questions, and requests work the same way: the end of the sentence establishes how the utterance relates to the listener.

Beyond the Basics / Advanced Use

You do not need to master the following points at A1, but they explain forms you will meet later.

Past marking before -고 is possible

The beginner rule “tense goes at the end” is an excellent default, not an absolute ban. Korean can place the past marker -았/었- before -고: 좋았고, 먹었고, 했었고. This often treats the first clause as an independently established past fact, especially in a contrast, explanation, or list of observations:

• 작년에는 바빴고 올해는 좀 한가해요. — I was busy last year, and this year I am a little less busy.
• 그 영화는 재미있었고 음악도 좋았어요. — The film was interesting, and the music was good too.

In a simple narrative, 아침을 먹고 나갔어요 remains the natural beginner pattern: the final past form places the sequence in the past.

-고 does not guarantee immediate completion

If you need to stress “after finishing A, then B,” Korean often uses -고 나서:

• 숙제를 하고 나서 게임을 했어요. — After finishing my homework, I played a game.

Plain 숙제를 하고 게임을 했어요 can describe the same order, but -고 나서 foregrounds completion and succession. Likewise, -자마자 is used later for “as soon as.”

Some -고 combinations become larger grammar patterns

Forms beginning with -고 are not always simple “and” connections. In 먹고 있어요, -고 있다 forms the progressive, “be eating.” In 가고 싶어요, -고 싶다 means “want to go.” Learn these as complete constructions rather than translating 고 separately each time.

Contrast and rhetorical effect

The neutral addition made by -고 can support a contrast when the vocabulary or context supplies it:

• 형은 조용하고 동생은 활발해요. — The older brother is quiet, while the younger sibling is lively.

Here -고 itself still connects facts; the opposing descriptions create the contrast. In careful English translation, “while” or “whereas” may sound better than “and.”

Practice Tips

1. Build two-part chains from dictionary forms. Pick five familiar verbs, remove -다, add -고, and finish with a polite verb: 읽다 → 읽고 자요. Say each chain aloud so you stop trying to add -고 after -아요/어요.
2. Sort examples by relationship. Make three short lists: sequences (먹고 가요), descriptions (싸고 좋아요), and independent facts (저는 요리하고 친구는 설거지해요). This prevents you from equating -고 only with “then.”
3. Retell a routine in one chain. Describe your morning with three actions, then change only the final verb to past tense. Compare 일어나고 씻고 먹어요 with 일어나고 씻고 먹었어요 and notice where the tense appears.

Related Concepts

• Prerequisite: Verb Stems — learn how to remove -다 and identify the form that takes -고.
• Next step: Progressive -고 있다 — use a larger -고 construction to describe an action in progress.
• Next step: While -(으)면서 — distinguish neutral connection or sequence from two actions happening at the same time.