Explanation
Provide an explanation or reason; 'it is that', 'the thing is', 'the reason is'.
Formation
Verb-casual + んです, い-Adjective + んです, な-Adjective + なんです, Noun + なんです
Detailed explanation
The ～んです grammar point is used to provide an explanation or reason for a situation or action. It can be translated as 'it is that', 'the thing is', or 'the reason is' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.
Examples
遅れたんですが、電車が遅れました。
Okuretan desuga, densha ga okuremashita.
I was late because the train was delayed.
疲れたんです。
Tsukareta n desu.
I'm tired (that's why).
彼は優しいんです。
Kare wa yasashii n desu.
The thing is, he is kind.
宿題が多いんです。
Shukudai ga ooi n desu.
The reason is I have a lot of homework.
Practice
Grammar content sourced from hanabira.org.