⒌和“as if, as though”连用，表示“比较”，例如：
● The man walked hurriedly, but suddenly stopped, as if remembering something.
● Helen sat down in a quiet corner, as though waiting for someone to come.
就一般情况说，现在分词短语作副词用途时，它的逻辑主语，就是句子的主语。但是如果分词短语的逻辑主语不是句子的主语时，它便要有自己的主语而形成独立结构(an absolute construction)，即：“主语+现在分词短语”。例如：
● He stared at the approaching girl, his eyes widening.
● All the participants having arrived, the chairman declared the meeting open.
必要时，现在分词短语也可以和“with,without”等连用。例如：
● With their breath running out, some weaker athletes had to stop playing.
● In a quiet place like that, the villagers generally do as they wish, without anybody trying to bother about them.
