わけだ
わけだ
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wakedaReason, Result, Response
Yuzuo Chan
|
28.06.2026
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
彼は十年もアメリカに住んでいたのか。英語が上手なわけだ。
外は雪が降っているのか。寒いわけだ。
傘を持っていなかったのか。それで服が濡れているわけだ。
昨日は十五時間も寝たそうだね。今日は元気なわけだ。
このバスは三十分に一本しかない。つまり、乗り遅れたら三十分待つわけだ。
毎月八万円の家賃を払っているから、一年では九十六万円払うわけだ。
grammarDetailPage.commonMistakes.title
grammarDetailPage.commonMistakes.wrong: 服が濡れわけだ。
grammarDetailPage.commonMistakes.correct: 服が濡れているわけだ。
grammarDetailPage.commonMistakes.why: わけだ must follow a complete plain-form predicate (here 濡れている). The bare stem 濡れ cannot be used.
grammarDetailPage.commonMistakes.wrong: 彼は学生わけだ。
grammarDetailPage.commonMistakes.correct: 彼は学生なわけだ。
grammarDetailPage.commonMistakes.why: A noun or na-adjective needs な before わけだ.
grammarDetailPage.commonMistakes.wrong: 明日は雨が降るわけだ。 (to say "it should rain tomorrow")
grammarDetailPage.commonMistakes.correct: 明日は雨が降るはずだ。
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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