Korean Particles — The Complete Guide
Particles are the backbone of Korean grammar. Master the 10 core particles — 은/는, 이/가, 을/를 — and Korean sentences will suddenly make sense.
Why Particles Matter So Much
In English, word order determines meaning. In Korean, particles do that job. "나는 사과를 먹어요" (I eat an apple) means the same even if you rearrange the words — the particles signal the role of each word. Master particles, master the language.
1. Topic Particle — 은/는
Equivalent to English "as for..." or Japanese は. Use 은 after a consonant, 는 after a vowel. Marks the topic or creates contrast.
2. Subject Particle — 이/가
Marks the grammatical subject. Use 이 after a consonant, 가 after a vowel. Used for new information or emphasis — the subtle 은/는 vs 이/가 distinction is a Level 3 topic, but start with: 이/가 = subject.
3. Object Particle — 을/를
Marks the object of an action — what you're doing something to. Use 을 after a consonant, 를 after a vowel.
Other Essential Particles
Putting It All Together
The best way to learn particles is through full sentences, not memorization lists. Level 3 has hands-on particle exercises to build natural intuition.
Next Steps
은/는 vs 이/가: Why This Is Hard
The 은/는 vs 이/가 question is the most-asked grammar question by intermediate Korean learners, and the answers you find online tend to oversimplify in misleading ways. The standard textbook explanation is that 은/는 marks the topic and 이/가 marks the subject, which is true but not actionable — most learners cannot tell at runtime whether a noun in their sentence is 'the topic' or 'the subject'.
A more useful framing: 은/는 marks information that is already part of the conversation (or assumed to be), and 이/가 marks information that is being introduced or focused on. The Korean equivalent of 'A cat is sitting on the table' uses 이 (a new cat being introduced); the equivalent of 'The cat is sitting on the table' (when the cat is already known) uses 은. This is essentially the same distinction English makes with 'a' vs 'the', but Korean makes it through particles rather than articles.
There is another layer: 은/는 also marks contrast. 'I like coffee, but my sister likes tea' uses 은 on both subjects because they are being contrasted with each other. 'My sister likes coffee' alone would use 가. The full system has about five interacting use cases, and our Level 3 lessons walk through them one at a time so you do not have to learn them all at once.
Particle Dropping in Real Conversation
Korean textbooks teach particles as obligatory, but in casual conversation Koreans drop them constantly. '밥 먹었어?' is a perfectly normal way to ask 'did you eat?' — there is no 을 after 밥. '나 학교 가' is a casual way to say 'I'm going to school' — no 는, no 에. The dropped particles are still grammatically there, but in spoken Korean they vanish at the same rate that English drops the 'that' in 'I think (that) you're right'.
When are they dropped? Roughly: when the relationship is clear from context, when the listener is a close friend or younger family member, and when the conversation is fast-paced. The polite forms (해요체, especially 합니다체) keep particles more reliably; the casual 반말 drops them aggressively. This is not random — there are patterns — but mastering them is a Level 5/6 skill, not a beginner one.
For now, the takeaway is: do not panic when you hear Korean without particles. The particles you have learned are still correct; you are simply hearing the casual version where they have been elided. As your listening comprehension improves, this will start sounding natural rather than confusing.
Stacking and Edge Cases
Korean particles can stack on top of each other in ways that can surprise beginners. 학교에서는 means 'at the school (as topic)', combining 에서 (location of action) with 는 (topic marker). 친구에게도 means 'also to a friend', combining 에게 (recipient) with 도 (also). The general rule is that particles marking grammatical role come first, then particles marking topic, contrast, or addition.
Some particles change form depending on whether the preceding word ends in a consonant or vowel. 은/는, 이/가, 을/를 all have this two-way variation: the consonant-form goes after consonants, the vowel-form after vowels. 학생 (consonant) takes 은, 학생을; 학교 (vowel) takes 는, 학교를. This is purely phonological — it exists to make the words easier to pronounce in sequence.
There are also a few edge cases where standard rules bend. The particle 이/가 sometimes attaches to itself in copula expressions: 학생이에요 (am a student) splits as 학생 + 이 + 에요 historically. The negation 아니다 (to not be) uses 이/가 marking on the noun: 학생이 아니에요 = 'I am not a student'. These bits of irregularity confuse beginners but become predictable with exposure.
Side-by-Side Comparison with Japanese Particles
For Japanese speakers, the Korean particle system maps onto Japanese particles with high precision. The famous は vs が distinction in Japanese is essentially the same calculation as 은/는 vs 이/가 in Korean — same use cases for topic, focus, contrast, and the same intuitions about given vs new information. If you already feel the difference between 私は学生です and 私が学生です in Japanese, you can carry that intuition almost directly into Korean.
を maps onto 을/를 cleanly. に splits into Korean 에 (destination, time, recipient) versus 에서 (location of action) — the same split Japanese makes more loosely with に and で. と maps onto 와/과. も maps onto 도. の maps onto 의 (though 의 is used less aggressively in Korean than の is in Japanese — Korean often omits it in cases where Japanese would require it).
The places where Japanese intuition can mislead: Korean 에서 has a tighter requirement to mean 'location of action' than Japanese で, which can also mean 'by means of'. For 'by means of' Korean uses 으로/로 instead. And Japanese から (from) is split in Korean into 에서 (from a place) and 부터 (from a time). These are small calibrations rather than major differences.
Most Common Particle Mistakes at Each Level
At the beginner level (Level 2-3), the most common mistake is using 은/는 for everything because it sounds like the polite default. This is a translation artifact from English textbooks that use 'is/am/are' frequently. The fix is exposure to natural Korean sentences where 이/가 dominates in question-and-answer patterns: 'who is here?' takes 가 on the answer ('철수가 있어요'), not 는.
At the lower intermediate level (Level 4), the most common mistake is overusing 에 where 에서 is required. 'I work at a company' should be 회사에서 일해요, not 회사에 일해요 — because 일하다 (to work) is an action verb that requires 에서. The pattern: 에 for verbs of being and going (있다, 가다, 오다), 에서 for verbs of doing.
At the upper intermediate level (Level 5), the most common mistake is mixing up 께 (honorific 'to') with the regular 에게/한테. 께 is required when the recipient deserves verb-internal honorification — your boss, your teacher, your grandmother. Using 에게 in those contexts is grammatical but socially off. This is where Japanese speakers tend to do well because the social calculus is very similar to keigo, and where English speakers need explicit practice.
Practice Particles for Real
Level 3 has interactive exercises that help you internalize particles through real sentence practice.