KOREAN VERB

약하다

to be weak

Conjugation

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

Form	Polite	Formal	Casual
AffirmativeI am weak
NegativeI am not weak

과거 · finished actions: 갔어요, 갔습니다, 갔어

Form	Polite	Formal	Casual
AffirmativeI was weak
NegativeI was not weak

미래 · plans and guesses: -(으)ㄹ 거예요

Form	Polite	Formal	Casual
AffirmativeI will be weak
NegativeI won’t be weak

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

Form	Polite	Formal
PresentI am weak (respectfully)
PastI was weak (respectfully)
FutureI will be weak (respectfully)

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

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

Present

저는 어릴 때부터 몸이 약해요.

I've had a weak body since I was small.
Past

수술 후에 한동안 많이 약했어요.

After the surgery I was very weak for a while.
Future

바람이 오후에는 약할 거예요.

The wind will be weak in the afternoon.
Honorific

할머니는 요즘 기운이 약하세요.

Grandma's energy is low these days.
Connectives

저는 추위에 약해서 겨울이 싫어요.

I'm weak against the cold, so I hate winter.

약하다 is weak in body, in strength and in heat or light: 불을 약하게 하세요, turn the heat down; 약 on its own is medicine.

The same pattern, on other verbs: descriptive verb.