他声称自己曾经是战争犯.
--- He claims to have been a war criminal.
众所周知,前任校长（headmaster）已退休了.
---It is known to all that the former headmaster has retired from his position.
尽管已尽了一切努力去做生意,但Phelps还是失败了.
--- Phelps ended up in failure though he had made every effort to do business.
提示:claim to do...(声称) ,it is known that...(众所周知) ,retire from(退出) ,make every effort（尽了一切努力）