Hearing their teacher's voice,the pupils stopped talking at once.(时间状语= When they heard their teacher's voice,the pupils stopped talking at once.）一听到老师的声音,学生们立即停止讲话.
Not knowing how to work out the difficult problem,he asked the teacher for help.（原因状语,= Because he didn't know how to work out the difficult problem,he asked the teacher for help.）因为不知道如何解这道难题,他求助老师.
Studying hard,you'll succeed.(条件状语,= If you work hard,you'll succeed.）如果你努力
学习,你会成功的.
Weighing almost one hundred jin the stone was moved by him alone.（让步状语,= Although the stone weighted almost one hundred jin,it was moved by him alone.）虽然那块石头重将近一百斤,他一个人就把它挪动了.
Their car was caught in a traffic jam,thus causing the delay.（结果状语,= Their car was caught in a traffic jam,thus it caused the delay.）他们的车遇上交通阻塞,因而耽误了.