语 境 自 主 领 悟
先观察原句 后自主感悟
1．Sometimes working outdoors，sometimes in an office，sometimes using scientific equipment and sometimes meeting local people and tourists，I am never bored．
2．Having worked hard all day，I went to bed early．
3．Having experienced quite a few earthquakes in Hawaii already，I didn't take much notice．
4．Having studied volcanoes now for many years，I am still amazed at their beauty as well as their potential to cause great damage． 1．例句1中的动词ing形式的一般式working，using，meeting与句子主语I构成逻辑上的主谓关系，与谓语动作同时发生，作原因状语。
2．例句2中的动词ing形式的完成式Having worked与句子主语I构成逻辑上的主谓关系，先于谓语动作发生，作时间状语。
3．例句3中的动词ing形式的完成式Having experienced与句子主语I构成逻辑上的主谓关系，先于谓语动作发生，作原因状语。
4．例句4中的动词ing形式的完成式Having studied与句子主语I构成逻辑上的主谓关系，先于谓语动作发生，作让步状语。
