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People said that there was gold in that cave句型转换的问题

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People said that there was gold in that cave句型转换的问题
要求是用there+被动+不定式的句型改写
there was said to have been gold in that cave.为什么这里要改为现在完成时,用there+被动+不定式的句型时,到底什么时候需要改变时态吖,是按照什么判断的?
People said that there was gold in that cave句型转换的问题
这个好掌握:动词不定式的形式为:to do,to be doing,to have done.
to do表示“一般情况,或将要去做的事情”.如:He is said to be a teacher.据说他是老师.
to be doing表示“不定式的动作正在进行.如:He is said to be writing a novel.据说他正在写一本小说.
to have done表示”不定式的动作已经发生.如:He is said to have finished his work.据说他已经完成了他的工作.
再问: 这些时态的基本用法我明白,但不能理解为什么这句子转换时要把一般过去式转化为现在完成时,请问能解释下么?
再答: 可以。不定式的完成时不叫现在完成时,只要是表示过去,不定式就需要用完成来表示。