Usages of ndesu
どうして 行った んです か。dousite itta ndesu ka.
(Explain to me,) why did you go?
予定 だった んです。yotei datta ndesu.
(It's because) it was the plan.
学校 は 面白い んです。gakkou ha omosiroi ndesu.
(It's because) school is interesting.
ここ は 静か 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?
風邪 を 引いた んです か。 薬 を 飲んだ 方 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.
予定な んです。yoteina ndesu.
(It's because) it's the plan.
公園 に 行かない。 暑い 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 便利な んです。sono sohuto ha benrina ndesu.
(It's because) that software is useful.
明日 は 休みな んです。asita ha yasumina ndesu.
(It's that) tomorrow is a holiday.
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