For beginners learning Korean grammar, one common challenge is connecting actions smoothly.
Instead of using short, simple sentences, learners often want to express more than one action at a time.
The grammar pattern -고 is one of the most basic and useful ways to do this.
In this guide, you’ll learn how to use -고 to connect actions naturally, see when it sounds correct, and practice with clear examples step by step.
Contents
- 1. What Does -고 Mean in Korean Grammar?
- 2. How Do You Use -고 to Connect Actions?
- 3. When Can You Use -고?
- 4. Common Confusions Beginners Have with -고
- 5. Key Points to Remember
- 6. Practice: Use -고 to Connect Actions
- 7. Answers
- 8. Common Mistakes When Using -고 (And How to Avoid Them)
- What to Learn Next After -고
1. What Does -고 Mean in Korean Grammar?
In Korean grammar, -고 is a connective ending used to link two actions, events, or states in one sentence.
It is often translated as “and” in English, but its role is not just listing.
-고 helps sentences flow smoothly by showing that actions are related.
Because of this, -고 is very common in everyday Korean and is usually one of the first connective endings beginners learn.
2. How Do You Use -고 to Connect Actions?
You attach -고 directly to the verb or adjective stem.
Form:
A/V-고
There are no special rules for vowels or consonants. Just add -고.
Examples:
- 저는 책을 읽고 커피를 마셨어요.
(I read a book and drank coffee.) - 그녀는 음악을 듣고 춤을 췄어요.
(She listened to music and danced.) - 엄마는 청소하고 저는 공부해요.
(Mom cleans and I study.)
These examples show how -고 connects actions naturally without repeating full sentences.
3. When Can You Use -고?
-고 is mainly used in the situations below.
(1) Sequential Actions
Use -고 when one action happens after another.
- 아침을 먹고 학교에 갔어요.
(I ate breakfast and went to school.) - 영화를 보고 집에 왔어요.
(I watched a movie and came home.)
(2) Related or Simultaneous Actions
-고 can also link actions that happen around the same time or are closely connected.
- 저는 영어를 배우고 일도 해요.
(I learn English and also work.) - 그는 TV를 보고 숙제를 해요.
(He watches TV and does homework.)
(3) Descriptive Adjectives
-고 can connect adjectives when they describe the same subject.
- 그 집은 크고 예뻐요.
(The house is big and pretty.) - 이 영화는 재미있고 감동적이에요.
(This movie is fun and touching.)
4. Common Confusions Beginners Have with -고
Instead of focusing on “wrong sentences,” let’s look at common points learners often get confused about.
(1) Tense Consistency
Many beginners wonder if the two clauses need the same tense.
In most cases, they do.
저는 점심을 먹고 학교에 갔어요.
(I ate lunch and went to school.)
Keeping the tense consistent makes the sentence sound natural.
(2) Using -고 with Adjectives
Some learners think -고 cannot be used with adjectives.
However, it works well when both adjectives describe the same noun.
그 집은 크고 예뻐요.
(This sentence is natural.)
(3) Overusing -고
Using -고 too many times in one sentence can sound unnatural.
저는 영화를 보고 책을 읽고 집에 가요.
The sentence is correct, but splitting it or reducing repetition sounds smoother in real conversation.
5. Key Points to Remember
- -고 is used to connect two or more actions or states without emphasizing time order, cause, or result.
- It does not require the same subject in both clauses, but the actions should be naturally related in context.
- When you want to clearly express a reason or result, endings like -아서/어서/해서 or –(으)니까 are usually more appropriate than -고.
- Both verbs and adjectives can be connected with -고, but learners should be careful not to confuse simple listing with contrast or consequence, which are better expressed with other grammar forms.
6. Practice: Use -고 to Connect Actions
- 우리는 주말에 여행을 __________ 새로운 친구들을 만들었어요.
(We traveled on weekends and made new friends.) - 그녀는 아침에 요가를 __________ 저녁에는 수영을 할 거예요.
(She will do yoga in the morning and swim in the evening.) - 저는 학교에 __________ 친구를 만났어요.
(I went to school and met my friend.) - 그는 책을 __________ 음악을 듣고 있어요.
(He is reading a book and listening to music.) - 우리는 밥을 __________ 영화를 볼 거예요.
(We will eat and watch a movie.) - 저는 운동을 __________ 샤워를 했어요.
(I exercised and took a shower.) - 그녀는 커피를 __________ 신문을 읽고 있어요.
(She is drinking coffee and reading the newspaper.) - 아이들은 놀이터에서 __________ 아이스크림을 먹었어요.
(The children played at the playground and ate ice cream.) - 저는 한국어를 __________ 일본어도 배울 거예요.
(I will study Korean and also learn Japanese.) - 그는 회사에서 일을 __________ 집에서 요리를 하고 있어요.
(He is working at the company and cooking at home.)
7. Answers
- 가고
- 읽고
- 먹고
- 하고
- 마시고
- 놀고
- 공부하고
- 하고
- 가고
- 하고
8. Common Mistakes When Using -고 (And How to Avoid Them)
Mistake 1: Using -고 to show cause or result
Learners often use -고 when they want to explain a reason or result.
- ❌ 비가 와서 길이 미끄럽고 넘어졌어요.
- ✔ 비가 와서 길이 미끄러워서 넘어졌어요.
Tip:
Use -고 to list actions or states.
If one situation causes another, -아서/어서/해서 or -(으)니까 is a better choice.
Mistake 2: Assuming -고 always shows time order
Some learners think the first action must happen before the second.
Tip:
With -고, the focus is on connection, not sequence.
If time order is important, consider using -고 나서 instead.
What to Learn Next After -고
Once you’re comfortable using -고 to connect actions, you can move on to other Korean connective endings.
If you want to understand the difference between -고 and -아서/어서/해서, check out our guide comparing these two commonly used Korean connectives. 👇👇👇
You may also want to learn how -아서/어서/해서 is used to express cause-and-result relationships. 👇👇👇