当前后主语一致时,用的doing是表进行吗?还是只有when doing是表进行?
She sat under the tree, reading a novel.
When reading a novel, she heard a knock at the door.
第一句是现在分词作伴随状语,第二句是省略了she was 的时间状语从句,都表示进行。
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短暂动词的现在分词作状语,为一般体意义,而不是进行体意义。例如:
He fell down, breaking his leg.
Falling to the groud, he broke his leg.