1Ichidan verbs (る-verbs)
Ends in いる or える. Note that not every verb that ends in いる or える is a る-verb.
2Godan verbs (う-verbs)
Every other verb that isn't a る-verb or irregular verb
3(Polite) present affirmative る-verbs
Drop る, add ます
4(Polite) present negative る-verbs
Drop る, add ません
5(Polite) present affirmative う-verbs
Change う to い, add ます
6(Polite) present negative う-verbs
Change う to い, add ません
7(Polite) present affirmative 来る
きます
8(Polite) present negative 来る
きません
9(Polite) present affirmative する
します
10(Polite) present negative する
しません
11(Polite) present affirmative ある
あります
12(Polite) present negative ある
ありません
13(Casual) present affirmative of ある
ある
16時々
ときどき Sometimes, occasionally
17全然
ぜんぜん Never, not at all
18余り
あまり Not often, not very much