Olga is wrong. I have an only on-line friend and we know eachother very good. But it's very rare case. It's quite hard to find a friend in real life, but on the internet you should find not only a friend, but a person who wants to have friends online and who can be online quite often. P.S. you can find a friend suddenly even if you dont' find him. But you can try to find a person with similar interests and maybe...

mugging is a type of robbery. robbery is taking somethig using fear and force. mugging is a robbery taking place outside - on the street, parkings and so on.

I tell you a big secret - most russians work with падежи only at school. And it seems to me for the one purpose - just to know why we talk this way. After that they happily forgive them. (Ok-Ok, maybe it's only about me =) ). We never remember them in our everyday speach, and we use correct endings only because we have greate experience in russian. So you need talk a lot with natives and gain an experience.

P.S. No. It's not translational question. It's about culture. You see, phrases 'Guten appetit', ' Bon appetit' contain word 'appetit' and mean something like 'have a good wish for food', but in english just 'enjoy a food'.