一、【伴随】表示动作（或状态）与主句主语的同时性、或伴生性，如：
He was speaking to the public, sliding his right hand into the pocket once in a while.
二、【目的】表示主句主语动作的结果，或（可能）引发或导致的后果，如：
He was speaking a lot to the public, hoping to turn them back if possible.
三、常见的
状语从句就要简单些，通过连接词就可判定其属性及意义，如：
伴随（with 型）：He was speaking to the his men with the right hand in the pocket from time to time.
目的（so that 型）He was speaking so masterfully that the workers would be turned back with his vain promises.
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