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わけだ

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わけだ
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Yuzuo Chan
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28.06.2026
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Meaning

So that's why A; no wonder A. Used when you learn a fact and understand that A naturally follows from it.
That means A; so A. Used to draw a logical conclusion or restate a situation.

Conjugation

(A)Vplain + わけだ: (A)Adjい + わけだ

Examples

Show translation
彼かれは十年じゅうねんもアメリカに住すんでいたのか。英語えいごが上手じょうずなわけだ。
外そとは雪ゆきが降ふっているのか。寒さむいわけだ。
傘かさを持もっていなかったのか。それで服ふくが濡ぬれているわけだ。
昨日きのうは十五時間じゅうごじかんも寝ねたそうだね。今日きょうは元気げんきなわけだ。
このバスは三十分さんじゅっぷんに一本いっぽんしかない。つまり、乗のり遅おくれたら三十分さんじゅっぷん待まつわけだ。
毎月まいつき八万円はちまんえんの家賃やちんを払はらっているから、一年いちねんでは九十六万円きゅうじゅうろくまんえん払はらうわけだ。

grammarDetailPage.commonMistakes.title

grammarDetailPage.commonMistakes.wrong: 服ふくが濡ぬれわけだ。
grammarDetailPage.commonMistakes.correct: 服ふくが濡ぬれているわけだ。
grammarDetailPage.commonMistakes.why: わけだ must follow a complete plain-form predicate (here 濡ぬれている). The bare stem 濡ぬれ cannot be used.
grammarDetailPage.commonMistakes.wrong: 彼かれは学生がくせいわけだ。
grammarDetailPage.commonMistakes.correct: 彼かれは学生がくせいなわけだ。
grammarDetailPage.commonMistakes.why: A noun or na-adjective needs な before わけだ.
grammarDetailPage.commonMistakes.wrong: 明日あしたは雨あめが降ふるわけだ。 (to say "it should rain tomorrow")
grammarDetailPage.commonMistakes.correct: 明日あしたは雨あめが降ふるはずだ。
grammarDetailPage.commonMistakes.why: わけだ explains or concludes from a known fact. For an expectation or prediction made beforehand, use はずだ.

Key points

Use it after a fact or cause you have just learned or established, to show you now understand why something is so (often after のか/んだ, or with それで/つまり) or to draw a logical conclusion. Unlike はずだ, which expresses an expectation about what should be true, わけだ explains or concludes from information already available. Unlike からだ, which states a cause directly, わけだ presents the result as a natural consequence of that cause.
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