은/는 vs 이/가: Korean topic and subject particles
Compare Korean topic and subject particles with short dialogues, consonant/vowel rules, and beginner practice with explanations.
은/는 marks a topic or contrast; 이/가 marks the subject. Choose 은 or 이 after a consonant, and 는 or 가 after a vowel. The right pair depends on what the sentence is doing in context.
Choose the form within a pair
책 ends with a consonant: 책은 and 책이. 친구 ends with a vowel: 친구는 and 친구가. These spelling choices are straightforward, but they do not decide whether you need a topic or a subject. First understand what you want to highlight, then choose the form that fits the noun.
Introduce a topic with 은/는
저는 학생이에요 means “As for me, I am a student,” naturally translated as “I am a student.” 저는 sets the topic for the rest of the sentence. A topic can also be a place, object, or time. 오늘은 쉬어요 can mean “Today, I rest / I am taking today off,” with today as the topic.
Identify a subject with 이/가
Imagine someone asks 누가 왔어요?, “Who came?” 민수가 왔어요, “Minsu came,” identifies the person. 이/가 is useful when saying who or what performs an action or has a state. It does not simply mean “new information” in every sentence; that shortcut will fail outside beginner examples.
Notice a contrast without forcing one
저는 차를 마셔요. 민수는 커피를 마셔요. means “I drink tea. Minsu drinks coffee.” The parallel topics support a contrast. But 은/는 does not always imply a strong correction or disagreement. Both topic and subject particles can occur in natural descriptions, with the surrounding conversation changing the emphasis. Learn complete exchanges, not a rule that labels one pair universally correct.
Keep these examples handy
| Expression or step | Reading or meaning | How to use it |
|---|---|---|
| 저는 학생이에요 | I am a student | Introduce yourself as the topic |
| 누가 왔어요? | Who came? | Ask for the subject |
| 민수가 왔어요 | Minsu came | Identify who came |
| 책은 / 책이 | topic / subject forms of 책 | After a final consonant |
| 친구는 / 친구가 | topic / subject forms of 친구 | After a vowel |
Check your understanding
Try each question before opening its answer.
Choose the subject form: 학생이 or 학생가.
학생이. 학생 ends with a consonant.
Reply to “Who came?” using 민수 and 왔어요.
민수가 왔어요. This identifies Minsu as the person who came.
Your questions, answered
Can both pairs be grammatical with the same noun?
Yes. Their functions and emphasis differ, so context matters.
Does 는 always mean “but”?
No. It can support contrast, but it is also used to establish a topic.
Keep exploring
These beginner explanations introduce practical language in context. Romanization is approximate. Consult the dictionary below for meanings and pronunciation.
- National Institute of Korean Language: Korean–English Learners’ Dictionary
- Online King Sejong Institute
For word meanings and pronunciation, open the learner dictionary linked above.
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