A1 Particles 16 min read Easy

Subject Particle 이/가

이/가 marks the grammatical subject and is essential for new information, questions, and embedded clauses.

Grammar Rule in 30 Seconds

Use 이/가 to identify the subject of your sentence; use 이 after consonants and 가 after vowels.

  • Use '이' after a noun ending in a consonant: '책이' (The book).
  • Use '가' after a noun ending in a vowel: '사과가' (The apple).
  • These particles mark the subject, showing who or what is performing the action.
Noun(Subject) + 이/가 + Verb/Adjective

Overview

In Korean, particles are fundamental suffixes that attach directly to nouns, pronouns, and sometimes other word types, indicating their grammatical role within a sentence. They function as the essential connectors that clarify relationships between words, often performing duties that prepositions or word order do in languages like English. Among these, the subject particle 이/가 (i/ga) stands as a cornerstone of basic Korean grammar.

This particle’s primary role is to unambiguously mark the grammatical subject of a sentence. This subject is the noun that either performs the action of the verb or is in the state described by an adjective or descriptive verb. Understanding 이/가 is crucial because it helps you identify the core actor or entity in a statement, shaping both meaning and emphasis.

While often compared to the topic particle 은/는 (eun/neun), 이/가 possesses distinct functions that are vital for clear and natural Korean communication. Misunderstanding this distinction is a common pitfall for beginners, making a thorough grasp of 이/가 essential from your first steps in the language.

How This Grammar Works

At its core, 이/가 functions as an identifying particle. It signals, "This noun, and specifically this one, is the subject." When you use 이/가, you are often pinpointing a specific individual, object, or concept that is either initiating an action or being described by a characteristic. This is unlike the topic particle, which sets a general theme.
Consider the sentence 사과가 맛있어요. (sagwaga masisseoyo. – The apple is delicious.). Here, 사과 (apple) is marked by as the specific entity that possesses the quality of being delicious. The focus is squarely on that specific apple and its taste.
This identifying function is especially prominent when you are introducing new information, responding to a direct question about 'who' or 'what,' or when emphasizing the subject's unique identity.
Linguistically, 이/가 performs an exhaustive identification. It implies that the noun it attaches to is the only one that fits the description or performs the action in the immediate context. For instance, if someone asks 누가 왔어요? (nuga wasseoyo? – Who came?), responding 친구가 왔어요. (chinguga wasseoyo. – My friend came.) implies that it was my friend specifically who arrived, and not anyone else.
This fundamental role in identifying and specifying makes 이/가 indispensable for conveying precise meaning in Korean.

Formation Pattern

1
The selection between 이 and 가 is determined by the final sound of the preceding noun or pronoun. This is a common phonetic rule in Korean grammar, known as 받침 (batchim) sensitivity, referring to whether a syllable ends with a consonant.
2
If the noun ends in a consonant (i.e., it has a batchim), you attach .
3
Example: (book) ends with (k), so it becomes 책이 (chaegi).
4
Example: 학생 (student) ends with (ng), so it becomes 학생이 (haksaengi).
5
If the noun ends in a vowel (i.e., it does not have a batchim), you attach .
6
Example: 친구 (friend) ends with (u), so it becomes 친구가 (chinguga).
7
Example: 의사 (doctor) ends with (a), so it becomes 의사가 (uisaga).
8
This simple rule ensures natural pronunciation flow and is consistently applied across various Korean particles. However, certain pronouns undergo mandatory contractions when combined with . These contracted forms are extremely common and essential for natural speech.
9
| Noun/Pronoun Ending | Particle | Base Form | Combined Form | Romanization | Meaning | Notes |
10
|:--------------------|:---------|:-----------------|:-----------------|:----------------|:-----------------|:------------------------------------------|
11
| Consonant (batchim) | | 선생님 (teacher) | 선생님이 | seonsaengnimi | teacher (subject) | 선생님 ends with (m) |
12
| Consonant (batchim) | | (house) | 집이 | jibi | house (subject) | ends with (p) |
13
| Vowel | | 가방 (bag) | 가방이 | gabangi | bag (subject) | 가방 ends with (ng) - No, 가방 ends with (a) in and (ng) in but the final syllable is ending in so it's a consonant ending. This example is incorrect. Let's fix this example. 가방 is a consonant-ending word. Let's use 바나나 (banana) instead. |
14
| Vowel | | 바나나 (banana) | 바나나가 | bananaga | banana (subject) | 바나나 ends with (a) |
15
| Vowel | | (I/me, formal) | 제가 | jega | I (subject) | Contraction: 저 + 가 |
16
| Vowel | | (I/me, informal) | 내가 | naega | I (subject) | Contraction: 나 + 가 |
17
| Vowel | | 누구 (who) | 누가 | nuga | who (subject) | Contraction: 누구 + 가 |
18
| Consonant (batchim) | | 무엇 (what) | 무엇이 (뭐가) | mueosi (mwoga)| what (subject) | 무엇 + 이 (formal), 뭐 + 가 (colloquial contraction) |
19
The contractions 제가, 내가, and 누가 are used universally in spoken and written Korean and must be memorized. Using 저가 or 나가 is grammatically incorrect and would sound unnatural to native speakers. Similarly, 뭐가 is the informal, common spoken contraction of 무엇이.

When To Use It

Employing 이/가 correctly is key to conveying precise meaning and sounding natural in Korean. Its usage centers on identifying, specifying, or introducing new information to the listener.
  1. 1Introducing New Information or an Unspecified Subject: When you are mentioning a subject for the very first time, or when the listener is not yet aware of the specific subject, 이/가 is the default choice. It functions to bring this new element into the conversation, highlighting its presence or action.
  • 어제 공원에 고양이가 있었어요. (eoje gongwone goyangiga isseosseoyo. – Yesterday, there was a cat in the park.) Here, 고양이 (cat) is introduced as new information.
  • 갑자기 비가 와요. (gapjagi biga wayo. – Suddenly, it's raining.) The rain is the new, specific event occurring.
  1. 1Answering 'Who?' or 'What?' Questions (Exhaustive Identification): 이/가 is almost exclusively used when specifically identifying a person or thing in response to direct questions like 누가 (who) or 무엇이/뭐가 (what). This usage carries a strong sense of exhaustive identification, implying "this one, and no other."
  • 누가 창문을 열었어요? (nuga changmuneul yeoreosseoyo? – Who opened the window?)
제가 열었어요. (jega yeoreosseoyo.I opened it.) You are specifically identifying yourself as the opener.
  • 뭐가 문제예요? (mwoga munje-yeyo? – What's the problem?)
컴퓨터가 안 돼요. (keompyuteoga an dwaeyo.The computer isn't working.) The computer is the specific issue.
  1. 1With Descriptive Verbs (Adjectives) and Verbs of Existence/State: Korean 형용사 (hyeong-yong-sa - descriptive verbs, often translated as adjectives) and verbs like 있다/없다 (to exist/not exist, to have/not have) predominantly use 이/가 to mark their subject. The particle identifies the noun that possesses the described quality or state.
  • 날씨가 정말 좋아요. (nalssiga jeongmal joayo.The weather is really good.) 날씨 is the subject of 좋다 (to be good).
  • 시간이 없어요. (sigani eopseoyo. – I don't have time / Time doesn't exist.) 시간 is the subject of 없다 (to not exist/have).
  • 음식이 매워요. (i eumsigi maewoyo. – This food is spicy.) 음식 is the subject possessing the quality 맵다 (to be spicy).
  1. 1In Subordinate Clauses (Relative Clauses, Adverbial Clauses): This is a critical grammatical rule for constructing complex sentences. When a clause modifies another noun or verb (e.g., a relative clause like "the person who I met"), the subject within that subordinate clause must take 이/가. It is grammatically incorrect to use 은/는 in this context.
  • 제가 어제 읽은 책이 재미있었어요. (jega eoje ilgeun chaegi jaemiisseosseoyo. – The book that I read yesterday was interesting.) Here, 제가 marks the subject of the embedded clause 제가 어제 읽다 (I read yesterday). 책이 is the subject of the main clause 재미있었어요 (was interesting).
  • 친구가 좋아하는 가수가 콘서트를 해요. (chinguga joahaneun gasuga konseoteureul haeyo. – The singer that my friend likes is having a concert.) 친구가 is the subject of 친구가 좋아하다 (friend likes), and 가수가 is the subject of 콘서트를 해요 (is having a concert).
  1. 1With ~이/가 아니다 (to not be) and ~이/가 되다 (to become): These constructions consistently use 이/가. Here, 이/가 marks the noun that the subject is not or becomes. It functions as a complement marker in these specific structures, identifying the state or identity being negated or achieved.
  • 그것은 제 가방이 아니에요. (geugeoseun je gabangi anieyo. – That is not my bag.) 제 가방 is the complement of 아니다.
  • 저는 요리사가 되고 싶어요. (jeoneun yorisaga doego sipeoyo. – I want to become a chef.) 요리사 is the result of 되다.

When Not To Use It

Knowing when to avoid 이/가 is as crucial as knowing when to use it. Misapplying it can lead to grammatically awkward sentences, or, more importantly, unintended shifts in meaning.
  1. 1When the Subject is Already the Established Topic: If a subject has already been introduced and is the focal point of a conversation or paragraph, you would typically switch to the topic particle 은/는. Repeatedly using 이/가 for an established subject would sound redundant or overly emphatic, as if you are re-identifying it every time.
  • Unnatural: 지민이가 한국 사람이에요. 지민이가 학생이에요. 지민이가 서울에 살아요. (Repetitive and unnatural emphasis on 지민 each time.)
  • Natural: 지민은 한국 사람이에요. 그리고 학생이에요. 서울에 살아요. (jimin-eun hanguk saramieyo. geurigo haksaengieyo. seour-e sarayo. – Jimin is Korean. And he/she is a student. He/she lives in Seoul.) Once 지민 is established as the topic, subsequent mentions can use 은/는 for continuity or even omit the particle if clear from context.
  1. 1To Mark a Direct Object: 이/가 is exclusively a subject particle. It never marks the direct object of a transitive verb. Direct objects are always marked by the object particle 을/를 (eul/reul). This is a fundamental distinction that must be understood early on.
  • Incorrect: 저는 김치가 먹어요. (This literally implies: "As for me, kimchi eats.") This makes 김치 the subject, which is nonsensical for the verb 먹다 (to eat).
  • Correct: 저는 김치를 먹어요. (jeoneun gimchireul meogeoyo. – I eat kimchi.) Here, 김치 is correctly marked as the object, the item being eaten.
  1. 1For General Statements or Broad Truths (Unless New Information): While not strictly forbidden in all cases, 은/는 often feels more natural for making general statements, expressing universal truths, or providing definitions. 이/가 tends to imply a more specific or current identification, even for general concepts.
  • Consider the nuance: 물은 중요해요. (mur-eun jungyohaeyo. – Water is important.) This is a general truth about water. Using 물이 중요해요. might introduce as a new subject, or imply, "This water, specifically, is important," adding an unintended specific context. Both can be grammatically acceptable, but the nuance shifts.

Common Mistakes

Beginners frequently encounter specific challenges when differentiating 이/가 from other particles, leading to common error patterns. Recognizing and understanding these mistakes will significantly accelerate your learning process.
  1. 1Overusing 은/는 for New Information or Specific Identification: This is perhaps the most prevalent error. Learners often default to 은/는 when 이/가 is required to introduce a new subject or to specifically identify "who/what."
  • Wrong: 어제 날씨는 좋았어요. (If 날씨 is being mentioned for the first time or if the specific quality of the weather is the focus.)
  • Correct: 어제 날씨가 좋았어요. (eoje nalssiga joasseoyo.The weather was good yesterday.) Here, 날씨 is the new, specific entity whose state is being described.
  1. 1Using 은/는 within Subordinate Clauses: This is a clear grammatical error. The subject within any modifying or embedded clause (like relative clauses modifying a noun) must be marked with 이/가, never 은/는. This is a strict rule.
  • Wrong: 제가 어제 만난 사람은 학생이에요. (The subject of the main clause, 사람, must be 사람이.)
  • Correct: 제가 어제 만난 사람이 학생이에요. (jega eoje mannan sarami haksaengieyo. – The person that I met yesterday is a student.) 사람이 is the subject of the main clause, and 제가 is the subject of the embedded clause.
Incorrect
3. Ignoring Contractions: Forgetting or misapplying the mandatory contractions for `나+가
내가, 저+가 → 제가, and 누구+가 → 누가` is a common but easily avoidable mistake.
  • Wrong: 저가 갔어요.
  • Correct: 제가 갔어요. (jega gasseoyo. – I went.)
  1. 1Confusing the Subject of Descriptive Verbs/Adjectives (Especially for English Speakers): In Korean, what might be an object in English can be the subject of a descriptive verb. This is particularly true for expressions of physical sensations or emotions, where the physical entity itself is the grammatical subject.
  • English: "I am hungry." / "My head hurts."
  • Korean (direct translation with object): 저는 배를 고파요. (Incorrect and unnatural.)
  • Korean (correct usage of 이/가): 배가 고파요. (baega gopayo.My stomach is hungry, or simply, I'm hungry.) 머리가 아파요. (meoriga apayo.My head hurts.) Here, (stomach) and 머리 (head) are the grammatical subjects, not "I" or "my."
  1. 1Misapplying Consonant/Vowel Rules: Simply mixing up whether to use 이 or 가 based on the preceding noun's final sound is a basic but common error.
  • Wrong: 책가 비싸요. (chaekga bissayo.) - ends in a consonant.
  • Correct: 책이 비싸요. (chaegi bissayo.The book is expensive.)

Common Collocations

Certain nouns, phrases, and grammatical constructions almost invariably appear with 이/가 due to its specific functional roles. Familiarizing yourself with these common collocations will help you internalize its usage more quickly and naturally, making your Korean sound more authentic.
  • Pronouns with emphasis/identification:
  • 제가 (jega) – I (formal, when identifying self as subject, e.g., answering "who?")
  • 내가 (naega) – I (informal, when identifying self as subject)
  • 누가 (nuga) – Who? (always with )
  • 무엇이 (mueosi) / 뭐가 (mwoga) – What? (formal 무엇이, common colloquial 뭐가)
  • Fixed expressions and phrases, often with descriptive verbs or verbs of existence:
  • 시간이 없어요. (sigani eopseoyo. – I have no time. / There is no time.)
  • 돈이 많아요. (doni manayo. – I have a lot of money. / There is a lot of money.)
  • 배가 고파요. (baega gopayo. – I'm hungry. / My stomach is hungry.)
  • 머리가 아파요. (meoriga apayo. – I have a headache. / My head hurts.)
  • 날씨가 좋아요. (nalssiga joayo. – The weather is good.)
  • 이름이 뭐예요? (ireumi mwoyeyo? – What is your name? / What is the name?) (이름 is the subject of 뭐예요)
  • 키가 커요. (kiga keoyo. – He/She is tall.)
  • 맛이 있어요. (masi isseoyo. – It tastes good. / There is taste.)
  • ~이/가 아니다 (~i/ga anida) – To not be ~ (e.g., 저는 학생이 아니에요. – I am not a student.)
  • ~이/가 되다 (~i/ga doeda) – To become ~ (e.g., 제가 선생님이 되고 싶어요. – I want to become a teacher.)
  • ~이/가 있다 / 없다 (~i/ga itta / eopta) – To have / not have ~ (e.g., 고양이가 있어요. – I have a cat. / There is a cat.)
These patterns are so common that you'll naturally absorb them with practice. They exemplify the identifying and state-describing functions of 이/가.

Contrast With Similar Patterns

The most significant and often challenging distinction for learners is between 이/가 and the topic particle 은/는. While both attach to nouns and can appear in similar positions, they serve fundamentally different purposes and convey distinct nuances. Mastering this contrast is paramount for natural and accurate Korean communication.
이/가 (Subject Particle) vs. 은/는 (Topic Particle)
| Feature | 이/가 (Subject Particle) | 은/는 (Topic Particle) |
|:---------------------|:--------------------------------------------------|:-----------------------------------------------------|
| Core Function | Identifies the grammatical subject; specifies who/what performs an action or is in a state. It often provides a specific answer to a question. | Establishes the topic of the sentence/discussion; marks "as for X," often with an implicit sense of contrast or comparison.
|
| Information Flow | Typically introduces new information or a specific item that the listener was not previously aware of. It points out. | Marks given/known information or context that is already established. It talks about something known. |
| Emphasis | Focuses intensely on the subject itself; highlights its identity or role. Implies "this one, and not that one." It answers the "who/what" precisely. | Focuses on the statement made about the topic.
Often implies a subtle contrast with something else, or a general truth. |
| Questions | Essential for forming and answering specific 누가 (who) / 뭐가 (what) questions. | Less common in direct answers to 누가/뭐가 questions unless the answer is for direct contrast. |
| Subordinate Clauses | Required for subjects within relative clauses (~ㄴ/은/는/ㄹ/을 + noun) and other embedded modifying clauses. Strict rule. | Forbidden for subjects within relative clauses. Violating this is a grammatical error. |
| General Statements | Can be used, but tends to frame the general statement as a new piece of information or a specific observation. | Very common for making general statements, definitions, or universal truths, setting a general context. |
| Descriptive Verbs/Adjectives | Default for subjects of descriptive verbs and adjectives (e.g., 좋다, 예쁘다, 있다, 없다). The subject possesses the quality. | Can be used, but might add a subtle nuance of contrast or emphasis on the topic's general state rather than a specific instance. |
Illustrative Examples for Nuance:
  • 비가 와요. (biga wayo. – It's raining.)
  • This is a simple statement of fact. You are identifying that it is rain which is falling. is new information.
  • 비는 와요. (bineun wayo. – As for the rain, it's falling. / Rain is falling [but perhaps snow isn't, or it's not sunny].)
  • This implies a contrast. Maybe the forecast was for snow, but rain, specifically, is what's happening. The focus is on as a topic being discussed, with a subtle comparison or contextualization.
  • 누가 제 커피를 마셨어요? (nuga je keopireul masyeosseoyo? – Who drank my coffee?)
제가 마셨어요. (jega masyeosseoyo.I drank it.)
  • Specific identification: I, and no one else, drank the coffee.
  • 저는 커피를 마셨어요. (jeoneun keopireul masyeosseoyo. – As for me, I drank coffee [but maybe others didn't, or I did it instead of something else].)
  • Focuses on "me" as the topic, contrasting with others or establishing what I did in a broader context.
Distinguishing from 을/를 (Object Particle):
이/가 marks the subject (the doer of an action or the entity described), while 을/를 (eul/reul) marks the direct object (the receiver or target of an action). These roles are fundamentally different and mutually exclusive.
  • 저는 책을 읽어요. (jeoneun chaekeul ilgeoyo. – I read a book.) (book) is the object, the thing being read.
  • 책이 재미있어요. (chaegi jaemiisseoyo.The book is interesting.) (book) is the subject of the descriptive verb 재미있다 (to be interesting).

Quick FAQ

Q: When should I use 제가/내가 vs. 저는/나는?

Use 제가 (formal) or 내가 (informal) when:

  • You are directly answering a "who?" question: 누가 왔어요? (nuga wasseoyo? – Who came?) 제가 왔어요. (jega wasseoyo. – I came.)
  • You want to emphasize that you specifically performed an action or are in a certain state.
  • You are introducing yourself as the subject for the first time in a context where your identity is the new, primary piece of information.
Use 저는 (formal) or 나는 (informal) when:
  • You are introducing yourself generally as the topic of discussion: 저는 학생이에요. (jeoneun haksaengieyo. – I am a student.)
  • You are making a general statement about yourself or providing contrast: 저는 한국어를 공부해요. (jeoneun hangugeoreul gongbuhaeyo. – As for me, I study Korean [perhaps others don't, or I do it instead of something else]).
Q: Can 이/가 be dropped in casual conversation?

Yes, frequently. Korean is a highly context-heavy language, and particles, including 이/가, are often omitted in casual spoken Korean when the subject is clear from the surrounding context. For example, instead of 친구가 왔어요, you might commonly hear 친구 왔어요. Similarly, 배가 고파요 often becomes 배 고파요. While grammatically crucial for clarity, native speakers prioritize efficient communication, and if there is no ambiguity, particles are often the first elements to be shortened or dropped.

Q: Are there specific verbs or adjective constructions that always use 이/가 for their subjects?

Absolutely. These typically fall into categories of descriptive verbs (adjectives) and verbs of existence/possession, where the subject is directly possessing the state or quality.

  • Existence/Possession: 있다 (to exist, to have), 없다 (to not exist, to not have).
  • 친구가 있어요. (chinguga isseoyo. – I have a friend. / There is a friend.)
  • 문제가 없어요. (munjega eopseoyo. – There is no problem.)
  • Descriptive Verbs/Adjectives: 좋다 (to be good), 싫다 (to be disliked), 예쁘다 (to be pretty), 크다 (to be big), 작다 (to be small), 맛있다 (to be delicious), 춥다 (to be cold), 덥다 (to be hot), 아프다 (to be sick/hurt), 어렵다 (to be difficult), 쉽다 (to be easy).
  • 커피가 맛있어요. (keopiga masisseoyo. – The coffee is delicious.)
  • 하늘이 파래요. (haneuri paraeyo. – The sky is blue.)
  • Verbs of becoming/not being: 되다 (to become), 아니다 (to not be).
  • 꿈이 이루어졌어요. (kkumi irueojyeosseoyo. – My dream came true. / My dream became realized.)
Q: What is the difference between 무엇이 and 뭐가?

무엇이 is the standard, more formal form of "what" when used as a subject. However, in virtually all everyday spoken Korean, it contracts to 뭐가 for ease of pronunciation. Both are grammatically correct, but 뭐가 is significantly more common in casual conversation.

  • 무엇이 필요해요? (Formal/Standard: What do you need?)
  • 뭐가 필요해요? (Common/Colloquial: What do you need?)
Mastering 이/가 is a cornerstone of A1 Korean. By understanding its role in identifying and specifying new information, particularly in contrast to the topic particle 은/는 and its strict usage in subordinate clauses, you will establish a robust foundation for building more complex and natural Korean sentences. This mastery will significantly enhance your comprehension of how Korean speakers structure their thoughts and guide conversations.

Subject Particle Selection

Noun Ending Particle Example Meaning
Consonant
책이
The book
Vowel
사과가
The apple
Consonant
학생이
The student
Vowel
의사가
The doctor
Consonant
선생님이
The teacher
Vowel
누가
Who

Meanings

The subject particle marks the noun that performs the action or possesses the quality described in the sentence.

1

Subject Identification

Identifying the actor of a verb.

“학생이 공부합니다.”

“비가 옵니다.”

2

Descriptive State

Identifying the subject of an adjective.

“날씨가 좋습니다.”

“꽃이 예쁩니다.”

3

New Information

Focusing on the subject as new information.

“누가 왔어요?”

“선생님이 왔어요.”

Reference Table

Reference table for Subject Particle 이/가
Form Structure Example
Affirmative
Noun + 이/가 + Verb
비가 와요 (It is raining)
Negative
Noun + 이/가 + 안 + Verb
비가 안 와요 (It is not raining)
Question
Noun + 이/가 + Verb?
누가 왔어요? (Who came?)
Short Answer
Noun + 이/가
제가요 (Me)
Adjective
Noun + 이/가 + Adjective
꽃이 예뻐요 (The flower is pretty)
Past Tense
Noun + 이/가 + Verb-past
친구가 갔어요 (The friend went)

Formality Spectrum

Formal
친구가 옵니다.

친구가 옵니다. (General statement)

Neutral
친구가 와요.

친구가 와요. (General statement)

Informal
친구가 와.

친구가 와. (General statement)

Slang
친구 와.

친구 와. (General statement)

Subject Particle Logic

Noun

Ends in Consonant

  • Book

Ends in Vowel

  • 사과 Apple

Examples by Level

1

개가 잡니다.

The dog is sleeping.

2

사과가 맛있어요.

The apple is delicious.

3

선생님이 왔어요.

The teacher arrived.

4

비가 와요.

It is raining.

1

누가 이 케이크를 만들었어요?

Who made this cake?

2

제 친구가 한국 사람이에요.

My friend is Korean.

3

오늘 날씨가 정말 좋아요.

The weather is really nice today.

4

지갑이 어디에 있어요?

Where is the wallet?

1

그 영화가 아주 재미있다고 들었어요.

I heard that the movie is very interesting.

2

제가 어제 산 옷이 작아요.

The clothes I bought yesterday are small.

3

한국어가 배우기 어렵지만 재미있어요.

Korean is hard to learn but fun.

4

버스가 벌써 떠났어요.

The bus has already left.

1

범인이 누구인지 아직 밝혀지지 않았습니다.

It has not been revealed who the culprit is.

2

그가 말한 사실이 모두 거짓으로 드러났습니다.

The facts he stated turned out to be all lies.

3

이 문제는 해결하기가 쉽지 않습니다.

This problem is not easy to solve.

4

그녀가 노래를 부를 때 모두가 조용해졌습니다.

When she sang, everyone became quiet.

1

정부가 발표한 정책이 국민의 지지를 얻고 있습니다.

The policy announced by the government is gaining public support.

2

그가 그토록 원하던 성공이 눈앞에 다가왔습니다.

The success he so desired is right before his eyes.

3

예상치 못한 결과가 도출되어 당황스럽습니다.

An unexpected result was derived, so I am flustered.

4

어떤 상황이 닥쳐도 우리는 포기하지 않을 것입니다.

No matter what situation arises, we will not give up.

1

그토록 갈망하던 자유가 마침내 그에게 주어졌습니다.

The freedom he so craved was finally granted to him.

2

본 연구가 시사하는 바가 매우 큽니다.

The implications of this study are significant.

3

그의 행동이 가져올 파장이 적지 않을 것입니다.

The repercussions of his actions will not be small.

4

어느 누구도 그가 이룬 업적을 부정할 수 없습니다.

No one can deny the achievements he has made.

Easily Confused

Subject Particle 이/가 vs Topic Particle (은/는)

Both mark nouns, but one is for subjects and one for topics.

Subject Particle 이/가 vs Object Particle (을/를)

Learners confuse the subject (doer) with the object (receiver).

Subject Particle 이/가 vs Location Particle (에/에서)

Learners sometimes use 이/가 for location.

Common Mistakes

책가

책이

Consonant ends need '이'.

사과이

사과가

Vowel ends need '가'.

저가

제가

Irregular form for 'I'.

나이

내가

Irregular form for 'I'.

선생님은 왔어요 (when answering 'Who came?')

선생님이 왔어요

Use '이/가' for new info, not '은/는'.

사과를 맛있어요

사과가 맛있어요

Adjectives take subject particles.

비가 옵니다

비가 옵니다 (correct, but often confused with topic)

Weather always takes subject particle.

그것은 내가 했어요

그것은 제가 했어요

Polite form required.

날씨는 좋아요

날씨가 좋아요

Descriptive verbs prefer subject particles.

누구는 했어요?

누가 했어요?

Question words take '가'.

정부는 발표한 정책이...

정부가 발표한 정책이...

Subject of relative clause.

그가 원한 성공은...

그가 원한 성공이...

Focus on the noun.

상황은 닥쳐도...

상황이 닥쳐도...

Conditional subject.

Sentence Patterns

___가/이 좋아요.

___가/이 왔어요.

___가/이 맛있어요.

___가/이 어렵지만 재미있어요.

Real World Usage

Texting constant

친구 왔어!

Ordering Food very common

커피가 맛있어요.

Job Interview common

제가 지원자입니다.

Travel common

버스가 어디에 있어요?

Social Media common

오늘 날씨가 최고!

Classroom constant

선생님이 질문했어요.

💡

Check the last letter

Always look at the last letter of the noun. If it's a consonant, use '이'. If it's a vowel, use '가'.
⚠️

Don't confuse with topic

Remember that '이/가' is for the subject, while '은/는' is for the topic. They are not interchangeable.
🎯

Use for new info

When introducing something for the first time, '이/가' is usually the better choice.
💬

Polite forms

Remember that '나' (I) becomes '내가' and '저' (I) becomes '제가'.

Smart Tips

If you are introducing something new, use '이/가'. If you are talking about something already known, use '은/는'.

사과는 맛있어요 (when first mentioning it). 사과가 맛있어요 (when first mentioning it).

Remember that '나' and '저' change form before '가'.

나가 했어요. 내가 했어요.

Always use '이/가' for weather phenomena.

날씨는 좋아요. 날씨가 좋아요.

Always use '이/가' with '누가' (who) and '무엇이' (what).

누구는 왔어요? 누가 왔어요?

Pronunciation

책이 [채기]

Linking

When '이' follows a consonant, it links to the previous sound.

사과가 [사과가]

Vowel Gliding

When '가' follows a vowel, it is pronounced clearly.

Statement

비가 와요 ↘

Falling intonation for facts.

Question

누가 왔어요? ↗

Rising intonation for questions.

Memorize It

Mnemonic

Remember 'Consonant-I' (C-I) and 'Vowel-Ga' (V-G). Think 'C-I-G' (Cigarette) to remember the order!

Visual Association

Imagine a 'C' (Consonant) wearing an 'I' hat, and a 'V' (Vowel) wearing a 'Ga' cape.

Rhyme

Consonant ends with an I, Vowel ends with a Ga, that's how we mark the subject, ha!

Story

A cat (고양이) sits on a mat. Because '고양이' ends in a vowel, it gets a '가'. The cat is the subject, so it says '고양이가 여기 있어요!' (The cat is here!).

Word Web

주어명사받침모음

Challenge

Write 5 sentences about things in your room using 이/가 in 5 minutes.

Cultural Notes

Used in all formal and informal contexts.

Particles are often dropped or changed in casual speech.

Particles are frequently omitted for brevity in texting.

These particles evolved from ancient Korean case markers.

Conversation Starters

오늘 날씨가 어때요?

누가 이 케이크를 만들었어요?

어떤 영화가 제일 재미있어요?

어떤 상황이 가장 당황스러웠어요?

Journal Prompts

Describe your favorite food.
Who is your best friend?
What happened today?
Reflect on a recent challenge.

Common Mistakes

Incorrect

Correct


Incorrect

Correct


Incorrect

Correct


Incorrect

Correct

Test Yourself

Fill in the correct particle.

책___ 재미있어요.

✓ Correct! ✗ Not quite. Correct answer:
책 ends in a consonant.
Choose the correct sentence. Multiple Choice

Which is correct?

✓ Correct! ✗ Not quite. Correct answer: 사과가 맛있어요
사과 ends in a vowel.
Fix the error. Error Correction

Find and fix the mistake:

학생가 공부해요.

✓ Correct! ✗ Not quite. Correct answer: 학생이 공부해요
학생 ends in a consonant.
Order the words. Sentence Building

비가 / 와요 / 오늘

✓ Correct! ✗ Not quite. Correct answer: 오늘 비가 와요
Subject particle marks the subject.
Convert to subject form. Conjugation Drill

나 (I)

✓ Correct! ✗ Not quite. Correct answer: 내가
Irregular form.
Match noun to particle. Match Pairs

Match each item on the left with its pair on the right:

✓ Correct! ✗ Not quite. Correct answer: 학생-이
Correct match.
Is this rule true? True False Rule

이/가 marks the object.

✓ Correct! ✗ Not quite. Correct answer: False
It marks the subject.
Complete the dialogue. Dialogue Completion

A: 누가 왔어요? B: ___.

✓ Correct! ✗ Not quite. Correct answer: 친구가
Subject marker for new info.

Score: /8

Practice Exercises

8 exercises
Fill in the correct particle.

책___ 재미있어요.

✓ Correct! ✗ Not quite. Correct answer:
책 ends in a consonant.
Choose the correct sentence. Multiple Choice

Which is correct?

✓ Correct! ✗ Not quite. Correct answer: 사과가 맛있어요
사과 ends in a vowel.
Fix the error. Error Correction

Find and fix the mistake:

학생가 공부해요.

✓ Correct! ✗ Not quite. Correct answer: 학생이 공부해요
학생 ends in a consonant.
Order the words. Sentence Building

비가 / 와요 / 오늘

✓ Correct! ✗ Not quite. Correct answer: 오늘 비가 와요
Subject particle marks the subject.
Convert to subject form. Conjugation Drill

나 (I)

✓ Correct! ✗ Not quite. Correct answer: 내가
Irregular form.
Match noun to particle. Match Pairs

Match correctly.

✓ Correct! ✗ Not quite. Correct answer: 학생-이
Correct match.
Is this rule true? True False Rule

이/가 marks the object.

✓ Correct! ✗ Not quite. Correct answer: False
It marks the subject.
Complete the dialogue. Dialogue Completion

A: 누가 왔어요? B: ___.

✓ Correct! ✗ Not quite. Correct answer: 친구가
Subject marker for new info.

Score: /8

Practice Bank

13 exercises
Fill in the blank with the correct subject particle (이 or 가). Fill in the Blank

문___ 열려 있어요. (The door is open.)

✓ Correct! ✗ Not quite. Correct answer:
Fill in the blank with the correct subject particle (이 or 가). Fill in the Blank

나___ 갈게요. (I'll go.)

✓ Correct! ✗ Not quite. Correct answer:
Fill in the blank with the correct subject particle (이 or 가). Fill in the Blank

음악___ 좋아요. (The music is good.)

✓ Correct! ✗ Not quite. Correct answer:
Translate into Korean using the correct subject particle. Translation

Who is coming?

✓ Correct! ✗ Not quite. Correct answer: 누가 와요?
Translate into Korean using the correct subject particle. Translation

The movie was interesting.

✓ Correct! ✗ Not quite. Correct answer: 영화가 재미있었어요.
Arrange the words into a correct Korean sentence. Sentence Reorder

어제 / 가 / 친구 / 와서 / 즐거웠어요

✓ Correct! ✗ Not quite. Correct answer: 어제 친구가 와서 즐거웠어요.
Arrange these words into a correct sentence. Sentence Reorder

이 / 제 / 최애 / 歌手 / 가수 / 예요

✓ Correct! ✗ Not quite. Correct answer: 이 가수가 제 최애예요.
Find and correct the particle error. Error Correction

갑자기 비는 내리기 시작했어요.

✓ Correct! ✗ Not quite. Correct answer: 갑자기 비가 내리기 시작했어요.
Correct the particle error in this sentence. Error Correction

내가 읽은 책은 재미있이 없었어요.

✓ Correct! ✗ Not quite. Correct answer: 내가 읽은 책은 재미없었어요.
Choose the most natural sentence for 'I'll take care of it' when volunteering. Multiple Choice

Which is most natural when volunteering to do something?

✓ Correct! ✗ Not quite. Correct answer: 제가 할게요.
Which sentence uses 이/가 correctly inside a relative clause? Multiple Choice

Choose the grammatically correct sentence.

✓ Correct! ✗ Not quite. Correct answer: 내가 만든 음식이 맛있어요.
Match each Korean sentence to its natural English meaning. Match Pairs

Match:

✓ Correct! ✗ Not quite. Correct answer: matched
Match each scenario to whether 이/가 or 은/는 is more natural. Match Pairs

Match:

✓ Correct! ✗ Not quite. Correct answer: matched

Score: /13

FAQ (8)

Because '사과' ends in a vowel, and the rule is Vowel + 가.

No, objects use '을/를'.

Yes, '나' becomes '내가' when used with the subject particle.

Use '은/는' when you want to set the topic or contrast.

Yes, '비가 와요' or '눈이 와요' are standard.

In casual speech, yes, but it's better to keep it for clarity.

The rule still applies to the final sound.

Only for pronouns like '나' and '저'.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

In Other Languages

Japanese high

ga

The usage of 'wa' vs 'ga' is slightly more nuanced in Japanese.

English low

None (Word Order)

English has no particles; Korean relies on them entirely.

Spanish low

None (Nominative case)

Spanish conjugation vs Korean particles.

German partial

Nominative case

German changes the article; Korean adds a suffix.

Chinese none

None

Chinese relies on strict SVO word order.

Arabic partial

Nominative case (Marfu')

Arabic uses vowel changes; Korean uses separate particles.

Learning Path

Prerequisites

Was this helpful?

Comments (0)

Login to Comment
No comments yet. Be the first to share your thoughts!