1. I am not certain what to do. (어떻게 해야 좋을지 모르겠다) 2. She was certain that the young man had gone mad. (그녀는 그 젊은이가 미친 것이 틀림없다고 생각했다) 3. His touch on the piano is very certain. (그의 피아노의 터치는 정확하다) 4. He was not certain whether he should obey her. (그는 그녀의 말에 따라도 좋은지 어떤지 망설이고 있었다) 5. They are certain to need help. (그들에게는 원조가 꼭 필요하다)
