Unit4 Sports Around the World-grammar素材
现在分词的完成式及被动式
1.现在分词作状语表示的动作与主句谓语动作同时发生时只要用现在分词的一般形式doing。例如：
Living in the downtown, we found a lot of amusements.
2.现在分词作状语表示的动作先于主句谓语发生时就要用现在分词的完成式having done形式。注意其否定形式是not having done 例如：
（1）Having heard from my father, I was relieved.
（2）Not having received any letter from my
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