걱정해요 · 걱정했어요 · 걱정할 거예요 · 걱정하지 마세요
to worry, to be concerned
Example
엄마가 제 건강을 많이 걱정해요.
My mom worries a lot about my health.
Word parts
Drop 하다 to get the noun 걱정 'worry': 걱정이 많아요 = I have a lot of worries.
Good to know
걱정하지 마세요 'Don't worry' is one of the most useful phrases; casually, just say 걱정 마.