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是何种使用方法？when引导条件状语从句还是时间状语从句？有什么不同？
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剖析为目前分词作宾语补足语还是us forgetting动名词复合结构作介词宾语？为何？
1 even 为副词，意为“甚至”，为夸克所说的下加状语，修饰名词词组，表示强调。甚至起初对某种气味不敏锐的人。when引导时间状语从句，兼有条件意味。
2 depend onsb doing sth. 指望某人做某事。这是动名词复合结构作depend on的宾语。sb可以用宾格也可以用属格。所以不是目前分词作宾补。
