高三英语知识点分词作状语

现在分词有两种时态：一般式doing和完成式having done。一般式通常表示与主句的谓语动词所表示的动作同时发生或无先后;完成式则强调分词所表示的动作先于谓语动词所表示的动作。如：

While walking in the street, we met some friends of (同时发生)

Having waited in the queue for half an hour, Tom suddenly realized that he had left his wallet at (“等待”先于谓语动词“意识到”)

分词的否定式的构成: not +分词。 Not having received a reply, he decided to write

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