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)?
Japanese Language Stack Exchange is a question and answer site for students, teachers, and linguists wanting to discuss the finer points of the Japanese language. Join them; it only takes a minute:
Here's how it works:
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
It's the past form of いけない, which in turn is the negative form of いける:
Like with any verb, the negative form of いける behaves like an い-adjective.