having spent some time in the city...求高手解释这是什么时态吖?have用现在分词,

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having spent some time in the city...求高手解释这是什么时态吖?have用现在分词,spent是过去分词.

having done
叫动名词的完成式,相当于过去完成时,是非谓语的一种,你的例句应该后面还有一个过去式的句子,表示,having spent some time in the city,在你后面的动作之前就发生了
再问：过去的过去以前，就用动名词的完成形式是吧？
再答：还要看逻辑主语和非谓语动词是不是主谓关系
再问：举个例子可以不？
再答： having spent the whole morning, i went home with an empty bag 没有连词，谓语动词是went,spent要处理成非谓语，i 和spend是主谓关系，本应该用spending ,但是，又是过去的过去，就用 having spent =i had spent the whole morning before i went home... =having spent he whole morning ,i went home with an empty bag

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