The man having been put in prison for many years这是独立主格请问一下，什么是独立主格啊，什么情况下才用到啊～独立主格结构是由名词或代词作为逻辑主语，加上分词、形容词、副词、动词不定式或介词短语作为逻辑谓语构成。实质就是带有自己主语的非限制状语从句The man having been put in prison for many years这是状语The man是逻辑主语，having been put in prison for many years 分词做逻辑谓语，nobody是真正的主语理解了吗？