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　　在通常情况下，分词作状语时它的逻辑主语应与句子主语一致，若不一致，则应改用其他句型。如：　　误：Crossing the road, a car knocked him down.　　正：Crossing the road, he was knocked down by a car. 过马路时他被车撞倒了。关于分词的独立主格结构　　正：When he was crossing the road, a car knocked him down. 他过马路时车子把他撞倒了。　

　　㈠ 分词或分词短语作状语时，可以表示　　时间、原因、条件、让步（可转换成相应的状语从句）　　① Put into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.　　Put into use in April 2000 == When it was put into use in April 2000（时间状语）　　②

　　例句：　　When they heard the news, they immediately set off for Shanghai.　　=Hearing the news, they immediately set off for Shanghai.　　在含有状语从句的主从复句中，可将状从转化为分词的形式，具体步骤如下：　　步骤一：去掉连词，但除特别强调外不可去或表让步转折如 unless, though, although 等不 可去。（注意：before, af