你说的是非谓语动词的独立成分-垂悬分词么？引导虚拟语气的时候，句子动词语气也用虚拟语气，其用法符合虚拟语气的语法规则，如provided that you had taken an umbrella ,you wouldn't have been caught in the rain.假如你带了雨伞，就不会被雨淋了，类似非谓语动词有：supposing,providing希望能帮到你
用分词短语结构替代条件从句
Having kown in time ,we could have stopped it.
=If we had kown in time ,we could have stopped it.
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