Conjugation of いけない or いける?


In "宿題をしなくてはいけなかった" meaning "Had to do homework.", is the word "いけなかった"
derived from "いける" (verb conjugation) or from "いけない" (i-adjective
conjugation)?




It's the past form of いけない, which in turn is the negative form of いける:

  * いける (plain)

  * いけない (negated)

  * いけなかった (negated-past)

Like with any verb, the negative form of いける behaves like an い-adjective.




It's the past form of いけない, which in turn is the negative form of いける:

  * いける (plain)

  * いけない (negated)

  * いけなかった (negated-past)

Like with any verb, the negative form of いける behaves like an い-adjective.

