가주어 it을 수동태로 하면 it ba pp that s v
that절의 주어를 수동태주어로 하면 s be pp to v 라고 배웠는데요 이 예문은 이렇게 바뀌는게 맞나요?

when a man came up with a dirthy face, they thought that he was a castaway.

-1. when a man came up with a dirthy face, he was thought to be a castaway
2. when a man came up with a dirthy face, it was thought that he was a castaway.

시제를 어떻게 해야하는지도 설명해주시면 감사하겟습니다^^!!!