[질문] had p p에는 예를 들어 무엇이있고 무슨뜻인가요?

1)과거완료:과거의한시점을중심으로그때까지의완료,결과,계속,경험을나타낸다She had solved the problem before그녀는전에문제를풀어본적이있다/2)대과거:과거