Reflexive verbs

[nanki--poo.livejournal.com]

hey guys and gals, was wondering if someone could give me a quick overview of reflexive verbs? I have just come across them in my russian text book, and I think I get them, but a few questions:

* whats the difference, other than in endings, of a reflexive verb - what separates a reflexive verb from a non-reflexive verb, in its meaning.
* do reflexive verbs have non reflexive versions?

For example I have met the word "Nahoditsa" - is located (and i'm afraid I can't type Russian on this computer). It seems to be a part of the things existence that it is located somewhere - a shop is located somewhere, by exisiting.

But then I met some words, like to worry, and to hope, and that seemed a bit less obvious as to why they're reflexive?

thanks, Mike.

Questions...

[lahalla-koala.livejournal.com]

We are having an exam in my Russian class next week, and part of the review is translating a passage from English to Russian. I just have a few sentences I'm confused about:

This room is mine.

I've read Anna Karenina by Tolstoy in Russian and now I can read it in in English too.

What case should "is mine" be in? I'm not sure how to say "by Tolstoy" or how to properly the structure the second half of of that statement.

Thanks in advance for any help provided!