-(으)ㄹ까 봐

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Worry or fear that something might happen (afraid that)

Examples

늦을까 봐 일찍 출발했어요.

I left early, afraid I might be late.

시험에 떨어질까 봐 걱정이에요.

I'm worried I might fail the exam.

아이가 감기에 걸릴까 봐 옷을 따뜻하게 입혔어요.

Afraid the child might catch a cold, I dressed him warmly.

길이 막힐까 봐 지하철을 탔어요.

Afraid the roads might be jammed, I took the subway.

잊어버릴까 봐 메모해 놓았어요.

Afraid I might forget, I wrote it down.