2.作时间状语

分词短语作时间状语，相当于一个时间状语从句。

Looking back，she congratulates herself on this decision．(人教大纲版高三第97页)

现在回顾起来，她庆幸自己做了那个决定。

Having enjoyed the rides at the Headland，visitors can take the shuttle to the Lowland．(人教大纲版高一下第66页)

游客乘车在高地游玩以后，可以坐穿梭车去低地。

提示：

此句相当于When they have enjoyed the rides at the Headland，visitors can take the shuttle to the Lowland．

The first country singers sang while playing the guitar．(人教大纲版高一上第148页)

最早的一批乡村歌手是边弹吉他边唱歌。

Walking in the street，he saw a shop for medicine．

=When he was walking in the street，he saw a shop for medicine．

在街上步行的时候，他看到了一家药店。

Dr．Manet te，having been kept a prisoner in the Bastille，Paris's most important prison，form any years，had recently been set free．

曼奈特医生被关在巴黎最重要的巴士底狱许多年以后，最近获释了。

Seen from the top of the hill，the city looked like a big garden．

从山顶上看，这个城市就像一个大花园。

提示：

此句相当于When it is seen from the top of the hill，the city looked like a big garden．

Armed with facts and figures，customers are better able to deal with the often powerful arguments given by a salesman or saleswoman．(人教大纲版高三第40页)

掌握了一些事实和数据之后，顾客就能更好地应付销售人员强有力的劝说。