What it means
のです adds an explanatory or emphatic tone to a statement. It often presents information as the reason, background, or clarification for what was just said or what is happening. The familiar form is のだ, while のです is the polite form. With verbs and い-adjectives, attach it directly to the plain form. With nouns and な-adjectives, insert な before the ending.
Usage note
のです can sound too strong or overly explanatory if used without a clear context. In familiar speech, のだ is often softened to んだ, and のです is often softened to んです, but these shortened forms are not used in the formulas here.
How to use it
今日は休みなのです。
Today is a day off, you see.
田中さんは親切なのです。
Tanaka is kind, you see.
このかばんは重いのです。
This bag is heavy, you see.
私は明日図書館で勉強するのです。
I will study at the library tomorrow, you see.
今日は休みなのだ。
Today is a day off, you see.
田中さんは親切なのだ。
Tanaka is kind, you see.
このかばんは重いのだ。
This bag is heavy, you see.
私は明日図書館で勉強するのだ。
I will study at the library tomorrow, you see.
Example sentences
今日は熱があるので、学校へ行かないのです。
Because I have a fever today, I am not going to school.
電車が遅れているのです。
The train is delayed.
この道は危険なのです。
This road is dangerous.
窓が開いているのです。
The window is open.
明日は試験があるので、