rules/ichidan/conjugations.yml
"casual":
"nonpast_indicative":
"affirmative":
"base": "う"
"attachment": ""
"negative":
"base": "あ"
"attachment": "ない"
"past_indicative":
"affirmative":
"base": "た"
"attachment": ""
"negative":
"base": "あ"
"attachment": "なかった"
"volitional":
"affirmative":
"base": "お"
"attachment": ""
"negative":
"base": "い" # root
"attachment": "まい"
"polite":
"nonpast_indicative":
"affirmative":
"base": "い"
"attachment": "ます"
"negative":
"base": "い"
"attachment": "ません"
"past_indicative":
"affirmative":
"base": "い"
"attachment": "ました"
"negative":
"base": "い"
"attachment": "ませんでした"
"volitional":
"affirmative":
"base": "い"
"attachment": "ましょう"
"negative":
"base": "い"
"attachment": "ますまい"