He stepped carelessly off the pa

He stepped carelessly off the pavement, so he was knocked down by a bus. (sentence with a verb-ing phrase)
【正确答案】：Stepping carelessly off the pavement, he was knocked down by a bus.
【题目解析】：包含ing分词短语的句子，其实质就是将一个分句变成ing短语，做另外一个分句的状语。在解题时，需要注意的是，注意ing分词的逻辑主语，不要出现垂悬修饰。