when/while doing |
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从属连词+doing作状语这种结构有二个来源: 第一、状语从句的主语与主句的主语相同,从句谓语为进行时态,此时可省略从句的主语+be。例如: While he was walking in the street, he was knocked over by a fast bicycle. = While walking in the street, he was knocked over by a fast bicycle. 第二、分词作作状语的时候,为了强调分词为何种状语,在分词前加从属连词予以突出状语的类别。例如: Knowing her son had an accident, she rushed to to the hospital. 这个分词短语本身就是时间状语,但为了突出状语的类别,可以加上when: When knowing her son had an accident, she rushed to the hospital. know是静态动词,不能用于进行体,所以不能这个句子是省略了she was。 由此可知,从句连词+doing作状语,有不同的来源,并非都是省略主语+be的结果。 |
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