Sb.is considered(to have invented还是having invented)

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Sb.is considered(to have invented还是having invented)

Sb.is considered(to have invented还是having invented)
Sb.is considered(to have invented还是having invented)

Sb.is considered(to have invented还是having invented)
应该说Sb.is considered to have invented,意思是 (人们) 认为有人已经发明了.
动词不定时的完成体形式 to have done 表示 “已经”或“以前”怎么样了,相对于谓语动词的时态而言,也就是说那件事情发生在谓语动词所表示的事件发生以前.假如谓语动词时过去时,那么这个 to have done 的事件就应该是过去的过去了.例如:
He was thought to have past the test.大家认为他已经通过了考试.(“大家认为”是在过去,那么“他已经通过了考试”当然是在过去的过去 --- 在“大家认为”的过去,先有“他通过了考试”,而后才有“大家认为”.)
原谅罗嗦,但希望是解释清楚了.

to have invented