質問: We recently learned んです form in class and I think I understand when to use it. But I'm a little unclear about how conjugation of it works. んです itself doesn't get conjugated, right? You conjugate the verb/noun/adjective that comes before it. * 頭がいたいんです。 * 風邪をひいたんです。 * 本が好きなんです。 And, as with な adjectives, な also gets added after nouns. But how would this work in the past tense?
回答: > > んです itself doesn't get conjugated, right? > > > んです(≂ のです; particle の + copula です) conjugates to: んです、んでした、んでしょう、(んでして、) -- polite んだ、んだった、んだろう、んで、んなら -- plain > > And, as with な adjectives, な also gets added after nouns. But how would this work in the past tense? > > > You replace な with だった, as in: 花**な**んです。→ 花**だった**んです。