2.表原因,可转换为as,since或because等引导的原因状语从句。 Deeply moved by the story,the excited people stopped quarrelling with each other. =Because they were deeply moved by the story,the excited people stopped quarrelling with each other. 激动的人们被那个故事深深地感动了,停止了争吵。 3.表条件,可转换为if,once或unless等引导的条件状语从句。 If heated,water can be turned into vapour. =If it is heated,water can be turned into vapour. 水如果被加热,会变成水蒸气。