现在分词作状语从句例句是：
Being ill (As he was ill)，she didn’t go to school yesterday.
Not knowing her telephone number，I couldn’t ring her up.
注：如果现在分词表示的动作在谓语动作之前发生，就需要用现在分词的完成式.
Having finished my work ahead of time (Because I had finished my work ...
时间，相当于时间状语从句。
