Sentence Analysis for the Experts

Hi,

Could someone please tell me the function (eg. what is it modifying) of the words, phrases and clauses I have marked below:

For example:



I don't know whether you are free to catch-up tonight or not. (Function: Noun Clause)

a. I'm going whether you like it or not. (?)
b. I don't know whether I should go or whether I should stay. (Function: 2 Noun Clauses??)

c. Most companies have suffered a drop in their profits, even very large companies. (?)
d. It was quite difficult to see, even with the light on. (?)

e. Most companies have suffered a drop in their profits, even very large companies. (?)
f. It was quite difficult to see, even with the light on. (?)