Don't get too stressed out if you fail the first time--that's how you learn! :) Here are some resources that might help you out. You can also learn a lot from the discussions here. Boa sorte! (Good luck!)

http://en.wikipedia.org/wiki/Portuguese_grammar

http://www.conjuga-me.net/

http://michaelis.uol.com.br/moderno/ingles/index.php

http://www.learn-portuguese-with-rafa.com/portuguese-grammar.html

Hi there Dovelove12, I'd be happy to help you with anything I can. I speak Portuguese relatively proficiently and I know where to get you help if I can't help you myself. Let's talk and give you a chance to show us that you're really a much better speaker than you think you are. :-)