Verbs · ㅡ drops
잠그다 conjugation
to lock · jamgeuda · sounds like [잠그다]
Short answer: “To lock” in Korean is 잠그다 (jamgeuda). Polite present: 잠가요 (jamgayo); past: 잠갔어요 (jamgasseoyo); future: 잠글 거예요. It is regular, but its ㅡ drops before 아/어.
- Present잠가요[잠가요] · jamgayo
- Past잠갔어요[잠가써요] · jamgasseoyo
- Future잠글 거예요[잠글 꺼예요] · jamgeul geoyeyo
- Negative안 잠가요[안 잠가요] · an jamgayo
잠그다 in sentences
- 나올 때 문을 잠갔어요?Did you lock the door when you left?
- 문을 잠그세요.Lock the door.
All forms of 잠그다
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| polite-아/어요 | 잠가요 | [잠가요] | jamgayo |
| formal-(스)ㅂ니다 | 잠급니다 | [잠금니다] | jamgeumnida |
| casual-아/어 | 잠가 | [잠가] | jamga |
| plain (written)-(느)ㄴ다 | 잠근다 | [잠근다] | jamgeunda |
| formal question-(스)ㅂ니까? | 잠급니까? | [잠금니까] | jamgeumnikka? |
| is …ing (polite)-고 있어요 | 잠그고 있어요 | [잠그고 이써요] | jamgeugo isseoyo |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| polite-았/었어요 | 잠갔어요 | [잠가써요] | jamgasseoyo |
| formal-았/었습니다 | 잠갔습니다 | [잠갇씀니다] | jamgatseumnida |
| casual-았/었어 | 잠갔어 | [잠가써] | jamgasseo |
| plain (written)-았/었다 | 잠갔다 | [잠갇따] | jamgatda |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| polite — will-(으)ㄹ 거예요 | 잠글 거예요 | [잠글 꺼예요] | jamgeul geoyeyo |
| formal-(으)ㄹ 겁니다 | 잠글 겁니다 | [잠글 껌니다] | jamgeul geomnida |
| casual-(으)ㄹ 거야 | 잠글 거야 | [잠글 꺼야] | jamgeul geoya |
| formal — I will (intention)-겠습니다 | 잠그겠습니다 | [잠그겓씀니다] | jamgeugetseumnida |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| not (short)안 … | 안 잠가요 | [안 잠가요] | an jamgayo |
| did not안 …았/었어요 | 안 잠갔어요 | [안 잠가써요] | an jamgasseoyo |
| not (long)-지 않아요 | 잠그지 않아요 | [잠그지 아나요] | jamgeuji anayo |
| cannot못 … | 못 잠가요 | [몯 짬가요] | mot jamgayo |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| honorific — present-(으)세요 | 잠그세요 | [잠그세요] | jamgeuseyo |
| honorific — past-(으)셨어요 | 잠그셨어요 | [잠그셔써요] | jamgeusyeosseoyo |
| honorific — formal-(으)십니다 | 잠그십니다 | [잠그심니다] | jamgeusimnida |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| please …-(으)세요 | 잠그세요 | [잠그세요] | jamgeuseyo |
| please … (for me)-아/어 주세요 | 잠가 주세요 | [잠가 주세요] | jamga juseyo |
| please don’t …-지 마세요 | 잠그지 마세요 | [잠그지 마세요] | jamgeuji maseyo |
| let’s … (formal)-(으)ㅂ시다 | 잠급시다 | [잠급씨다] | jamgeupsida |
| let’s … (casual)-자 | 잠그자 | [잠그자] | jamgeuja |
| do … ! (casual command)-아/어라 | 잠가라 | [잠가라] | jamgara |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| … and-고 | 잠그고 | [잠그고] | jamgeugo |
| … so / and then-아/어서 | 잠가서 | [잠가서] | jamgaseo |
| if …-(으)면 | 잠그면 | [잠그면] | jamgeumyeon |
| … but-지만 | 잠그지만 | [잠그지만] | jamgeujiman |
| because …-(으)니까 | 잠그니까 | [잠그니까] | jamgeunikka |
| … and / but (background)-는데 | 잠그는데 | [잠그는데] | jamgeuneunde |
| even if …-아/어도 | 잠가도 | [잠가도] | jamgado |
| while …-(으)면서 | 잠그면서 | [잠그면서] | jamgeumyeonseo |
| in order to …-(으)려고 | 잠그려고 | [잠그려고] | jamgeuryeogo |
| (go) to …-(으)러 | 잠그러 | [잠그러] | jamgeureo |
| before …-기 전에 | 잠그기 전에 | [잠그기 저네] | jamgeugi jeone |
| after …-(으)ㄴ 후에 | 잠근 후에 | [잠근 후에] | jamgeun hue |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| (that) … now-는 | 잠그는 | [잠그는] | jamgeuneun |
| (that) …ed-(으)ㄴ | 잠근 | [잠근] | jamgeun |
| (that) will …-(으)ㄹ | 잠글 | [잠글] | jamgeul |
| Form | Korean | Sounds like | Romanized |
|---|---|---|---|
| I want to …-고 싶어요 | 잠그고 싶어요 | [잠그고 시퍼요] | jamgeugo sipeoyo |
| can …-(으)ㄹ 수 있어요 | 잠글 수 있어요 | [잠글 쑤 이써요] | jamgeul su isseoyo |
| cannot …-(으)ㄹ 수 없어요 | 잠글 수 없어요 | [잠글 쑤 업써요] | jamgeul su eopseoyo |
| have to …-아/어야 해요 | 잠가야 해요 | [잠가야 해요] | jamgaya haeyo |
| may … / it’s OK to …-아/어도 돼요 | 잠가도 돼요 | [잠가도 돼요] | jamgado dwaeyo |
| must not …-(으)면 안 돼요 | 잠그면 안 돼요 | [잠그면 안 돼요] | jamgeumyeon an dwaeyo |
| …ing (noun)-기 | 잠그기 | [잠그기] | jamgeugi |
How 잠그다 changes
The ㅡ in 잠그다 drops before 아/어: 잠가요, 잠갔어요. The vowel that replaces it follows the syllable before (아 after ㅏ or ㅗ, otherwise 어). With other endings ㅡ stays: 잠그면, 잠급니다.
Questions
How do you say “lock” in Korean?
“To lock” is 잠그다 (jamgeuda), pronounced [잠그다]. In a sentence: 나올 때 문을 잠갔어요? — Did you lock the door when you left?
What is the past tense of 잠그다?
잠갔어요 (jamgasseoyo) is the polite past tense of 잠그다 (“to lock”). Formal: 잠갔습니다; casual: 잠갔어.
How do you say 잠그다 politely?
Everyday polite: 잠가요 (jamgayo). Formal: 잠급니다. Casual, with close friends: 잠가.
How do you say “I want to lock” in Korean?
잠그고 싶어요 (jamgeugo sipeoyo), pronounced [잠그고 시퍼요].
Is 잠그다 irregular?
No. The ㅡ in 잠그다 drops before 아/어: 잠가요, 잠갔어요. The vowel that replaces it follows the syllable before (아 after ㅏ or ㅗ, otherwise 어). With other endings ㅡ stays: 잠그면, 잠급니다.
More ㅡ-stem words like 잠그다
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Forms follow 한글 맞춤법 (Korean spelling rules); pronunciation follows 표준 발음법 and romanization follows 국어의 로마자 표기법 (Revised Romanization). Last updated October 16, 2026. How we check