This is missing one major thing that helps understand actually spoken Japanese: ら抜き(ranuki), the fact that most people drop the ら in られる. So, e.g. たべられる becomes

This is missing one major thing that helps understand actually spoken Japanese: ら抜き(ranuki), the fact that most people drop the ら in られる. So, e.g. たべられる becomes たべれる. There's an extra る in 降るられた, BTW.