KOREAN VERB

잠그다

to lock

Conjugation

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현재 · now and habits: polite, formal and casual speech

Form	Polite	Formal	Casual
AffirmativeI lock
NegativeI don’t lock

과거 · finished actions: 갔어요, 갔습니다, 갔어

Form	Polite	Formal	Casual
AffirmativeI locked
NegativeI didn’t lock

미래 · plans and guesses: -(으)ㄹ 거예요

Form	Polite	Formal	Casual
AffirmativeI will lock
NegativeI won’t lock

높임말 · to or about an elder: the -시- forms

Form	Polite	Formal
PresentI lock (respectfully)
PastI locked (respectfully)
FutureI will lock (respectfully)

연결 어미 · and, so, if, because, but: joining two sentences

명령형 · -(으)세요, -(으)십시오, the casual form, -지 마세요

One sentence for each tense, the way people say it.

Present

저는 나갈 때 항상 문을 잠가요.

I always lock the door when I go out.
Past

어젯밤에 나갈 때 현관문을 잠갔어요?

Did you lock the front door when you went out last night?
Future

자기 전에 창문을 다 잠글 거예요.

I'll lock all the windows before bed.
Honorific

할머니는 외출하기 전에 가스를 꼭 잠그세요.

Grandma always turns off the gas before going out.
Connectives

문을 잠그지만 열쇠는 화분 밑에 둬요.

I lock the door, but I leave the key under the flowerpot.
Requests and commands

나갈 때 꼭 문을 잠그세요.

Be sure to lock the door when you leave.

문을 잠그다 is to lock a door and 수도를 잠그다 to turn off the tap; the opposite is 열다 or 틀다.

The same pattern, on other verbs: verb.