Essential Particle Review: Topic, Subject, Object

🌈 The Big Picture

🎨 The Core Particle Family

• 저는 학생이에요. (As for me, I'm a student.)

• 이 식당은 맛있어요. (This restaurant — unlike others — is delicious.)

• 비가 와요. (It's raining. / Rain is falling.)

• 친구가 왔어요. (A/the friend came.)

• 저는 김치를 좋아해요. (I like kimchi.)

• 책을 읽어요. (I'm reading a book.)

• 저도 학생이에요. (I am also a student.)

• 김치도 좋아해요. (I like kimchi too.)

• 저만 알아요. (Only I know.)

• 물만 마셔요. (I only drink water.)

🛠️ How They Work in a Sentence

1. 저는 비빔밥을 좋아하지만 라면은 안 좋아해요.
(As for me, I like bibimbap, but I don't like ramen.)
— 는 marks "I" as the topic and "ramen" as a contrasted topic; 을 marks 비빔밥 as the object.

2. 동생이 와서 같이 밥을 먹었어요.
(My younger sibling came, and we ate together.)
— 이 marks 동생 as the subject (the one who came); 을 marks 밥 as the object of "ate."

3. 저도 커피만 마셔요.
(I also only drink coffee.)
— 도 ("also") attaches to 저 in place of 는; 만 ("only") attaches to 커피 in place of 를.

🧩 General Formation Rule

• 은/는 — 은 after a consonant, 는 after a vowel → marks topic/contrast

• 이/가 — 이 after a consonant, 가 after a vowel → marks the grammatical subject

• 을/를 — 을 after a consonant, 를 after a vowel → marks the direct object

• 도/만 — attach directly to the noun, completely replacing any topic/subject/object particle

📚 Cross-check note

🪞 Synonym Alert

• 은/는 vs 이/가 — 은/는 sets up the topic, often with a sense of "as opposed to something else"; 이/가 simply identifies who or what is doing the action, often introducing new information.

• 이/가 vs 을/를 — 이/가 marks the doer (subject); 을/를 marks the receiver of the action (object).

• 도 vs 만 — 도 means "also/in addition"; 만 means "only/exclusively" — near-opposite functions.

• 을/를 vs 에 — 을/를 marks a direct object acted on directly (먹다, 보다, 사다); 에 marks a location or destination (가다, 있다) — don't mix these up.

• 는 vs 가 (after a vowel) — both can follow vowel-ending nouns, but 는 marks topic/contrast while 가 marks the subject; context decides which is needed.

⚠️ Pitfalls to Dodge

• ❌ Using 이/가 when you mean to set up a contrast → ✅ 은/는 — "I like coffee, but he likes tea" needs 는 for contrast.

• ❌ Saying 을/를 with location verbs like 가다 → ✅ 에 — 학교을 가요 (✗) → 학교에 가요 (✓).

• ❌ Stacking particles like 이가도 or 을를만 → ✅ 도/만 replace the particle entirely — 저도 (✓), not 저가도 (✗).

• ❌ Forgetting that 은/는 changes based on the noun's final sound → ✅ 은 after consonants, 는 after vowels.

• ❌ Dropping particles altogether in writing → ✅ Particles are required in written/formal Korean, even if casual speech sometimes drops them.