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on sight N,

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on sight N,
The guards were ordered to shoot on sight anyone trying to escape.卫兵接到命令,看见谁企图逃跑就立即开枪射击.
They had orders to shoot on sight.
他们接到命令说见人就开枪。
Next time,I kill you on sight,you hear me?
下次再让我见到,肯定就会杀了你听到没有?
on sight N,
on sight 本身是介词短语,含“一看到就”、“ 一经要求就”或“一露面就”的意思,相当于immediately when seeing 、at once when seeing 或 as soon as ,既可以用作连词引导状语从句,也可以直接用作副词短语作状语.
 
第一个句子的 on sight  起连词作用,引导状语从句 anyone trying to escape,修饰主句中的动词,意思是“一看见有人试图逃跑马上就命令卫兵开枪”.可以改写如下:
 

The guards were ordered to shoot (as soon as they saw) anyone trying to escape.

 
另外的两个句子中的 on sight 都是做状语的副词短语,可以分别改写如下:
 

They had orders to shoot (immediately when seeing anyone).

Next time,I kill you (at once when I saw you),you hear me?