False. It can make things possessive. The cabin belonging to Tom becomes Tom’s cabin.
Cannot becomes can’t, but that is a contraction, not a conjunction.
Conjunctions are “linking” words like and, but, yet, or, nor, etc.
While reading it, did you feel happy or sad? The tone is basically the over all feel of the book; but from what I've heard about it, the book is actually kind of saddening.