原因状语和目的状语的区分

题目

原因状语和目的状语的区分
怎样正确原因状语和目的状语,尤其是现在分词作改成分时?
如Not wanting to fright him,I ...
这里Not wanting to fright him作的是什么成分,还是都可以讲?
并请概括引申一下.
请不要复制原因状语和目的状语的概念,谢谢.弄懂加分.
书上注释是目的状语

答案

这里的Not wanting to fright him,I...作的状语成分是原状语,因为这里用的是分词结构,意思上可以理解为I...because I don't want to fright
举个例子：
Being sick ,I stayed at home
也就是 I stayed at home because I am sick.
目的状语通常使用不定式
They stood by the roadside to talk about the plan．他们站在路边为的是谈论这个计划.(目的状语 )
如果这句用分词
They stood by the roadside talking about the plan．他们站在路边谈论着这个计划.(伴随状语)