Japanese Bases..

I tried to understand the explaination of Japanese verb bases in "My Japanese Coach", but it got confusing...
Can someone help me understand? Thanks people :)

LOL!Whoever told you you could learn Japanese easily by playing a videogame coach?Unlike most Western languages Japanese has a more complex structure, if you want to learn the language it's best you attend Japanese Language classes, that is if memorizing thousands of Kanji & Kanji-kana combinations won't turn you bonkers that is.