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Verbs る-form in Japanese are divided into 3 groups

Group 1: Verbs ending in う

あう あいます To meet
いく いきます To go
およぐ およぎます To swim
おす おします To push
あそぶ あそびます To play
のむ のみます To drink
まつ まちます To wait
うる うります To sell

Group 2: Verbs ending in る

Verbs that end in る but are preceded by /a/, /u/, /i/ or /o/ sounds belong to group 1 verbs. Example: おわる  (owaru): to finish, つくる(tsukuru) : to create; きる (kiru): to cut, etc.
Verbs that end in る but are preceded by /e/ sound belong to group 2 verbs. For example: たべる(taberu): to eat, おぼえる  (oboeru): to remember.
Exception: かえる (kaeru): to return, to go home (ends with “eru” but is a verb of group 1)
In addition, some group 2 verbs in Japanese are irregular verbs. They that end in “iru” are group 2 verbs such as: おきる (okiru): wake up, あびる (abiru): take a bath.

あける あけます To open
おきる おきます To get up

Group 3: Only 2 words する and くる
くる きます To come
しごと（を）する しごと（を）します To work
でんわ（を）する でんわ（を）します To call
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