WordんだndaMeaningthe explanation is that...; it is that....Part of speechexpressionPronunciationCourseJapaneseLessonOffering explanation with んですUsages of nda風か邪ぜ を 引ひいた んだ。kaze wo hiita nda.(It's because) I caught a cold.明あし日た は 行いかない。 お金かね が ない んだ。asita ha ikanai. okane ga nai nda.I'm not going tomorrow. (It's because) I don't have any money.便べん利りな んだ。benrina nda.(It's because) it's convenient.