1. However , it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when exposed to it often enough.
even是何种用法?when引导条件状语从句还是时间状语从句?有何区别?
2. But what we forget—what our economy depends on us forgetting—is that happiness is more than pleasure without pain.
depends on us forgetting分析为现在分词作宾语补足语还是us forgetting动名词复合结构作介词宾语?为什么?