Here's a table of regular verb endings: http://italian.about.com/library/fare/blverbs01.htm Hope it helps with other verbs too. Wish there was a grammar lesson here!
Me, too. I think this is a shortcoming of the Duolingo and other "natural" language teaching methods, that they don't give you a quick base of knowledge to work from, or the ability to see things side-by-side to see/notice the patterns better and remember them. The natural way is good, but it's better if you supplement it with a bit of rote memorization so you're not confused at the start.