When to use to act in Korean
Korean: 행동하다[ haeng-dong-ha-da ]

When to use it
행동하다 means “to act” or “to behave.” You use it when talking about what a person does in a situation, especially if they act in a good, bad, calm, or polite way. It is often used with words like “kindly,” “politely,” or “safely.”
Example sentences
집에서는 조용히 행동해요.
I act quietly at home.
학교에서 친구에게 친절하게 행동해요.
I act kindly to my friend at school.
길에서는 안전하게 행동하세요.
Please act safely on the road.
선생님과 이야기할 때 예의 있게 행동해요.
I behave politely when talking with the teacher.
가게에서 예의 바르게 행동했어요.
I behaved politely at the store.
여행할 때 현지 규칙대로 행동해야 해요.
You should act according to local rules when traveling.