4.作条件状语

分词短语作条件状语，相当于一个条件状语从句。

A person standing at the foot of a high mountain will find himself very small．一个人如站在大山的脚下会发现自己很渺小。

提示：

此句相当于If a person stands at the foot of a high mountain，he will find himself very small．

United，we stand;divided，we fall．

联合起来我们就能站立，分裂我们就必然倒下。

Being more careful，you can make fewer mistakes．

如果更细心一些，你会犯更少的错误。

Lying on the ice，I would soon die．(人教大纲版高一下第31页)

如果躺在冰雪上，我很快就会冻死的。

Time would be lost waking him．(人教大纲版高三第53页)

叫醒他要费时间。

Given more attention，the trees could have grown better．

假如多给些照顾，那些树会长得更好。

提示：

此句相当于If more attention was given，the trees could have grown better．

Heated，liquids can be changed into gases．

=If they are heated，liquids can be changed into gases．

如果加热的话，液体就会变成气体。

Applied in his machine，it would cut off the earth's power．(人教大纲版高二下第92页)

如果(这种材料)用于这个机器的话，它就会切断地球的引力。