This is conditional and there's four kinds of conditionals, I think. or three, I don't know. So, "se eu fosse..." is "if I was...", "se eu tivesse..." >> "if I had...", "se eu falasse..." >> "if I spoke..."
As you see, this conditional in which you express something improbable (is this word right wroten? hehe) or even a little bit probable, you use: if + past simple (and + would, the second sentence); but I know a very nice website: http://grammarnet.com/ghtml/cond2.htm
I hope that helps you,