Explanation
Provides an explanation or gives background information; 'the fact is', 'the reason is', 'actually'.
Formation
Verb-casual + のです, い-Adjective + のです, な-Adjective + なのです, Noun + なのです
Detailed explanation
The ～のです grammar point is used to provide an explanation or give background information on a situation, often used when there is a need to justify or clarify one's statement. It can be translated as 'the fact is', 'the reason is', or 'actually' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.
Examples
Kono hon wa muzukashii no desu.
This book is difficult, you see.
Ashita wa isogashii no desu.
The fact is, I am busy tomorrow.
Kanojo wa eigo no sensei na no desu.
The reason is, she is an English teacher.
Watashi wa kaze na no desu.
Actually, I’ve got a cold.
Practice
Grammar content sourced from hanabira.org.