There are two types of verbs, ichidan and godan (and a handful of exceptions likeする)
Ichidan verbs conjugate to negative by removing the る and adding ない. The なかった is just a further conjugation of ない to past tense
たべる
たべない
たべなかった
Godan verbs conjugate to negative by swapping the last character with the one on the same hiragana row that ends in A instead of U, e.g. す–>さ 、る–>ら and then adding ない、tho う–>わ is an exception
かえる
かえらない
かえらなかった
かす
かさない
かさなかった
かう
かわない
かわなかった
You are following some kind of book like genki or something right? It should clarify these things for you
There’s also a daily thread for this kind of thing
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There’s no such thing as らなかった as a unit
There are two types of verbs, ichidan and godan (and a handful of exceptions likeする)
Ichidan verbs conjugate to negative by removing the る and adding ない. The なかった is just a further conjugation of ない to past tense
たべる
たべない
たべなかった
Godan verbs conjugate to negative by swapping the last character with the one on the same hiragana row that ends in A instead of U, e.g. す–>さ 、る–>ら and then adding ない、tho う–>わ is an exception
かえる
かえらない
かえらなかった
かす
かさない
かさなかった
かう
かわない
かわなかった
You are following some kind of book like genki or something right? It should clarify these things for you
There’s also a daily thread for this kind of thing