Is it Ichidan or Godan?
This is a chart that will help you decide.
A (base 1) I (base 2) U (base 3) E (base 4) O (base 5)
Godan Aru ----- Uru ----- Oru
Ichidan ----- Iru ----- Eru -----
Follow the chart, it's not that hard. For example, TabERU (to eat) would be ichidan because it ends with ERU. To figure out the verb it must be in it's dictionary form (base 3, see Verb Base Chart).
Charts
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