He pondered for several minutes before (making) a decsion.ma

He pondered for several minutes before (making) a decsion.making的语法结构?
He pondered for several minutes before( he made) a decision.
He pondered for several minutes before (making) a decsion.
请问第二句直接介词before直接用动名词making是一种什么语法结构?如果是主动就用动名词表示?如果被动就用made 很多定语从句省略连接词时也是这么用的,但具体语法名称叫什么?