主要考查你对 现在分词的完成式 等考点的理解。
现在分词完成式的概念：从动作关系上看，现在分词的完成式主要表示发生在谓语动作之前的动作；从用法上看，现在分词完成式主要用作状语，表示时间或原因等。
1、表示时间：
如：Having finished her work, she went home.
这样用的现在分词通常可以转换成时间状语从句。
After she had finished her work, she went home. 她干完工作就回家了。
2、表示原因：
Having been there many times, he offered to be our guide.
这样用的现在分词通常可以转换成原因状语从句
As he had been there many times, he offered to be our guide.
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