求非谓语动词用法

题目

求非谓语动词用法
the iron content of tomato sauce cooked in an iron pot for three hours showed a striking increase, the level going up nearly 30 times.
“the level going up nearly 30 times” going up ,是什么用法,为什么要ing呢,我知道该句子谓语是showed,实在不明白going是什么用法
能否给出详细的非谓语用法的解释,谢了,
还有,coffee can interfere with iron being absorbed into the body.
这个being 又当如何理解呢.谢谢 ,回答的越具体越好,不要太笼统,回答得好,肯定多加分,谢谢了

答案

going up 是现在分词,因为它属于非谓语动词,即不能做谓语,所以要ing,表示主动.如果是过去分词就表示被动.
非谓语动词在句中可作状语、定语、宾补等.但不能作谓语
the level going up nearly 30 times
是独立主格结构.也就是说这个分词going up的逻辑主语与句子的主语不同.
这个独立主格结构在句中做状语.
with iron being absorbed into the body.中being absorbed into the body就是宾语补足语.