the explanation is that...; it is that....
Part of speech

Usages of ndesu

どうして った んです か。dousite itta ndesu ka.
(Explain to me,) why did you go?
てい だった んです。yotei datta ndesu.
(It's because) it was the plan.
っこう は おもしろい んです。gakkou ha omosiroi ndesu.
(It's because) school is interesting.
ここ は しずか で は ない んです。koko ha sizuka de ha nai ndesu.
(It's because) it's not quiet here.
どう した んです か。dou sita ndesu ka.
What's wrong?; What's happened?
 を いた んです か。 くすり を んだ ほう が いい です。kaze wo hiita ndesu ka. kusuri wo nonda hou ga ii desu.
Have you caught a cold? You should take some medicine.
ていな んです。yoteina ndesu.
(It's because) it's the plan.
こうえん に かない。 あつい んです よ。kouen ni ikanai. atui ndesu yo.
I'm not going to the park. (It's because) It's (too) hot!
その ソフト は 便べんな んです。sono sohuto ha benrina ndesu.
(It's because) that software is useful.
あし は やすみな んです。asita ha yasumina ndesu.
(It's that) tomorrow is a holiday.
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