〜わけだ
wake da
By Nihongo PathUpdated
This form is also taught at JLPT N3, where it carries a different sense or register.
Meaning
that is why, so it follows that, no wonder
〜わけだ marks a conclusion that follows naturally from what has been said or learned: 十年日本にいたのか。道理で日本語が上手なわけだ (no wonder his Japanese is good). It can also restate something in other words (つまり〜というわけだ) or show that a result is logically expected (三割引だから七千円になるわけだ).
Both speech and writing. Very common in conversation when something suddenly makes sense (そういうわけか). Often paired with 道理で, つまり, だから, それで. The polite form is わけです.
Formation
V = verb, N = noun, A = adjective.
Verb / い-adjective (plain form) + わけだな-adjective + な + わけだNoun + の / という + わけだRestating: つまり〜というわけだQuestion: どういうわけか (for some reason) / そういうわけか (I see)
Visual diagram
- 十年も日本にいたnewly learned fact
- → 道理でno wonder
- 日本語が上手なthe observed result
- わけだso that explains it
Natural examples
彼は十年も日本にいたのか。道理で日本語が上手なわけだ。
かれはじゅうねんもにほんにいたのか。どうりでにほんごがじょうずなわけだ。
He was in Japan ten years? No wonder his Japanese is good.
道理で + わけだ: a fact explains an observation.
三割引だから、一万円が七千円になるわけだ。
さんわりびきだから、いちまんえんがななせんえんになるわけだ。
It's 30 percent off, so 10,000 yen becomes 7,000 yen.
A logical calculation: 30 percent off, so 7,000 yen.
つまり、彼女は来ないというわけですね。
つまり、かのじょはこないというわけですね。
So in other words, she is not coming, is that it?
というわけですね: confirming a restated conclusion.
エアコンがついていない。寒いわけだ。
エアコンがついていない。さむいわけだ。
The air conditioner is off. No wonder it's cold.
Observation explained by a discovered cause.
彼は毎日五時間練習している。上手になるわけだ。
かれはまいにちごじかんれんしゅうしている。じょうずになるわけだ。
He practices five hours a day. Of course he gets good.
Expected result from a known cause.
Similar grammar and the difference
Partial denial ('it's not that'); the negative of a conclusion. Compare side by side
Strong denial ('no way'). Compare side by side
〜はずだ
Expectation before confirmation; わけだ is a conclusion after learning the cause.
〜のだ / 〜んだ
General explanation; わけだ specifically draws a logical consequence.
Common mistakes
- ✗
- 寒いだわけだ。
- ✓
- 寒いわけだ。
- Why
- い-adjectives attach directly.
- ✗
- 上手わけだ。
- ✓
- 上手なわけだ。
- Why
- な-adjectives need な.
- ✗
- 明日は雨が降るわけだ。(as a forecast)
- ✓
- 明日は雨が降るはずだ / だろう。
- Why
- わけだ is not a prediction; it needs a known cause leading to a conclusion.
どういうわけか = for some reason; そういうわけで = for that reason. 〜というわけだ restates or summarizes. わけだ often closes an explanation that began with 〜から / 〜ので.
JLPT N2 tips
On the exam
- Look for 道理で, つまり, だから, それで before the blank; they signal わけだ.
- Check the connection: な after な-adjectives, の / という after nouns.
- Distractors are わけではない, わけがない, わけにはいかない; only わけだ is a positive conclusion.
Frequently asked questions
What does 〜わけだ mean?
that is why, so it follows that, no wonder. 〜わけだ marks a conclusion that follows naturally from what has been said or learned: 十年日本にいたのか。道理で日本語が上手なわけだ (no wonder his Japanese is good). It can also restate something in other words (つまり〜というわけだ) or show that a result is logically expected (三割引だから七千円になるわけだ).
How do you form 〜わけだ?
Verb / い-adjective (plain form) + わけだ / な-adjective + な + わけだ / Noun + の / という + わけだ / Restating: つまり〜というわけだ / Question: どういうわけか (for some reason) / そういうわけか (I see). V = verb, N = noun, A = adjective.
When is 〜わけだ used?
Both speech and writing. Very common in conversation when something suddenly makes sense (そういうわけか). Often paired with 道理で, つまり, だから, それで. The polite form is わけです.
What is the difference between 〜わけだ and 〜わけではない?
Partial denial ('it's not that'); the negative of a conclusion.
What is the difference between 〜わけだ and 〜わけがない?
Strong denial ('no way').
What is a common mistake with 〜わけだ?
Wrong: 寒いだわけだ。 Right: 寒いわけだ。 い-adjectives attach directly.
Quick check
彼は元プロの選手だったのか。道理でサッカーが上手な（ ）。