3 连词+分词（短语）
有时为使分词短语与主句关系更清楚，可在分词前加连词。 连词有： when，while，if though，after, before, as. 但分词的主语和主句的主语必须为同一个，如：
While waiting there, he saw two pretty girls come out of the building.
waiting 和saw 的主语相同。
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