Why are these details of setting omitted?

In the book hatchet why did brian think searchers would not find him

Which two sentences are written in subjunctive mood? take this money and go buy some clothes for yourself. i was happy because i passed the test, which i studied for. if only my umbrella would fix itself, then i could go out in this weather. i'm going on a trip to canada, but i'm not taking you with me. if i were the thief, i would have turned myself in before i got caught.

What image of late nineteenth century british society does the importance of being earnest