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のだ
no da
JLPT N3
Edit  Stefanie
Meaning
explanation
explanation
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Formation
Phrases
どうしたんですか。かおいろがわるいですよ。
What happened? You are really pale.
Edit  #7786 Stefanie
どうしたのですか。あたまがいたいのです。
What's wrong with you? I have a headache.
Edit  #7787 Stefanie
Discussion and comments
No da ist used for formal and written expressions.
It is used to give a sentence a tone of explanation. Or of asking for an explanation, if it is followed by "ka".
The "no" makes the whole preceding part of the sentence into a single noun-like entity.

"no" is often abbreviated to "n" in the common speech.
Stefanie