에 and 에서: At, in, to, from

에 vs 에서: the one choice that decides both

Most particle pairs are annoying. This one is worth the trouble, because 에 and 에서 come up in almost every sentence you'll ever say about where you are or what you're doing.

The rule under the rule

Textbooks usually say 에 is "at" and 에서 is "at". Which is true and completely useless.

Here's the version that actually works. Ask what the verb is doing. If the verb is about being somewhere — existing, staying, arriving — the place takes 에. If the verb is an action performed somewhere, the place takes 에서.

• 집에 있어요. jib-e isseoyo — "I'm at home." 있다 is existence, so 에.
• 집에서 자요. jib-eseo jayo — "I sleep at home." Sleeping is something you do, so 에서.

Same house. The house didn't change; the verb did.

Where learners get it wrong

The mistake I made for months was treating 에 as the default and reaching for it whenever I saw a place.

• 학교에 공부해요 hakgyoe gongbuhaeyo. ✗
• 학교에서 공부해요. hakgyo-eseo gongbuhaeyo ✓ — "I study at school."

공부하다 gongbuhada · "to study" is an action, so the school is where the action happens, and that's 에서 every time.

The reverse trap is just as common:

• 학교에서 가요 hakgyoeseo gayo means "I'm leaving from school," not "I go to school."
• 학교에 가요. hakgyo-e gayo ✓ — "I go to school."

Going somewhere makes the place a destination, not a workplace. Destinations take 에.

에서 also means "from"

This is the second job people forget. 에서 marks where something started.

• 한국에서 왔어요. hangug-eseo wasseoyo — "I came from Korea."
• 서울에서 부산까지 seoul-eseo busan-kkaji — "from Seoul to Busan"

So 에서 covers both "the place the action happens" and "the place it came from". Context separates them without much effort, because the verb tells you which one you're looking at.

에 marks time, and 에서 doesn't

에 has a whole second life that has nothing to do with place.

• 세 시에 만나요. se si-e mannayo — "Let's meet at three."
• 월요일에 시작해요. woryoil-e sijakaeyo — "It starts on Monday."
• 2월에 갈 거예요. i-wol-e gal geoyeyo — "I'll go in February."

에서 never marks a point in time. If you're marking when something happens, the answer is 에 or nothing at all. The only place you'll see 에서 next to a time is a range: 두 시에서 세 시 사이에 du si-eseo se si saie, "between two and three".

And "nothing at all" is the trap. The everyday time words refuse the particle:

• 오늘 만나요. oneul mannayo — "Let's meet today." Never 오늘에 oneure.
• 내일 갈게요. naeil galgeyo — "I'll go tomorrow." Never 내일에 naeire.

The same goes for 어제 eoje · "yesterday", 지금 jigeum · "now" and 언제 eonje · "when". Clock times, dates and days of the week take 에; the words that already mean a time on their own don't.

The two-second check

When you're mid-sentence and stuck, run this:

1. Am I marking a time? Then 에, unless it's 오늘 oneul / 내일 naeil / 어제 eoje, which never take 에. 2. Am I marking a place? Then look at the verb. 3. Is the verb about being or going there? 에. 4. Does the verb put someone or something there, like 앉다 anjda · "to sit", 놓다 nota · "to put" or 넣다 neota · "to put in"? 에: 의자에 앉아요 uija-e anjayo, "I sit on the chair." 5. Is the verb something you do there, or is the place where you came from? 에서.

If you want to see the pair lined up against each other in more detail, there's a full comparison page for it.

에 for "per"

에 also does the job of "per" or "each". Put it after the unit, and the amount comes next:

• 하루에 세 번 먹어요. harue se beon meogeoyo "I take it three times a day."
• 일주일에 두 번 운동해요. iljuire du beon undonghaeyo "I work out twice a week."
• 한 개에 천 원이에요. han gaee cheon wonieyo "They're 1,000 won each."

You'll hear the last one at every market stall, so it's worth knowing.

에 for a cause

With some verbs, 에 marks the thing that set something off. English would say "at", "from" or "because of":

• 큰 소리에 깼어요. keun sorie kkaesseoyo "I woke up at a loud noise."
• 바람에 문이 닫혔어요. barame muni dachyeosseoyo "The door blew shut in the wind."

It's usually a specific trigger, like a noise, a gust or something someone said. For a general reason, Korean uses 때문에 ttaemune instead.