GRAMMAR
〜わけだ
that's why
no wonder
Explanation
NOTE
〜わけだ expresses a logical conclusion from known facts — "so that's why" or "no wonder".
10年日本に住んでいたんですね。日本語が上手なわけだ。
You lived in Japan for ten years. No wonder your Japanese is good.
Used to express a logical conclusion based on a reason.
NOTE
Use it when a situation makes complete sense given what you know. Follows verb, i-adj, na-adj (plain form), or noun.
STRUCTURE
V普
わけだ電車が止まっていたわけだ。
Densha ga tomatte ita wakeda.
No wonder the train had stopped.
彼女が来ないわけだ。
Kanojo ga konai wakeda.
So that's why she isn't coming.
彼は毎日練習するわけだ。
Kare wa mainichi renshuu suru wakeda.
So that's why he practices every day.
STRUCTURE
Adj-I普
わけだ冬だから寒いわけだ。
Fuyu dakara samui wakeda.
It's winter, so naturally it's cold.
高かったわけだ。本物の革だったんだ。
Takakatta wakeda. Honmono no kawa dattan da.
No wonder it was expensive. It was genuine leather.
毎日残業して忙しいわけだ。
Mainichi zangyou shite isogashii wakeda.
Working overtime every day — no wonder he's busy.
STRUCTURE
Adj-Na普
わけだ子供の頃から絵を習っていたから上手なわけだ。
Kodomo no koro kara e o naratte ita kara jouzu na wakeda.
She's been learning painting since childhood — no wonder she's skilled.
長年経験があるから有名なわけだ。
Naganen keiken ga aru kara yuumei na wakeda.
He has years of experience — no wonder he's famous.
海外で育ったから英語が得意なわけだ。
Kaigai de sodatta kara eigo ga tokui na wakeda.
She grew up abroad — no wonder she's good at English.
STRUCTURE
N普
わけだ彼は医者なわけだ。
Kare wa isha na wakeda.
So that means he is a doctor.
彼女は専門家だったわけだ。
Kanojo wa senmonka datta wakeda.
No wonder — she was a specialist.
今日は祝日なわけだ。店が閉まっているんだね。
Kyou wa shukujitsu na wakeda. Mise ga shimatte iru n da ne.
Today is a holiday — no wonder the stores are closed.
Practice exercises
1
終電がなくなったので、歩いて帰るわけだ。
Since the last train is gone, that's why I am walking home.
Answer
わけだ
2
昨日から熱がある。かぜをひいた訳だ。
I have had a fever since yesterday. No wonder I caught a cold.
Answer
訳だ
3
毎日練習しているわけだ。上手になったね。
You practice every day — no wonder you've gotten good.
Answer
わけだ
4
薬を飲んだわけだ。元気になったね。
You took the medicine — no wonder you're feeling better.
Answer
わけだ
5
夜中まで働いたわけだ。眠いね。
You worked until midnight — no wonder you're sleepy.
Answer
わけだ
6
窓が開いているから寒いわけだ。
The window is open — no wonder it's cold.
Answer
わけだ
7
塩を入れすぎたから辛いわけだ。
I added too much salt — no wonder it's salty.
Answer
わけだ
8
朝ご飯を食べなかったからお腹が空いたわけだ。
I didn't eat breakfast — no wonder I'm hungry.
Answer
わけだ
9
音がしないから静かなわけだ。
There's no sound — no wonder it's quiet.
Answer
わけだ
10
駅が近いから便利なわけだ。
The station is close — no wonder it's convenient.
Answer
わけだ
11
毎朝走っているから健康なわけだ。
He runs every morning — no wonder he's healthy.
Answer
わけだ
12
彼は先生なわけだ。話し方が丁寧だね。
He's a teacher — no wonder he speaks politely.
Answer
わけだ
13
今日は日曜日なわけだ。学校が休みだね。
Today is Sunday — that's why school is closed.
Answer
わけだ
14
彼女は音楽家なわけだ。歌が上手だね。
She's a musician — no wonder she sings well.
Answer
わけだ
15
毎日練習しているから上手なわけだ。
You practice every day — no wonder you're good.
Answer
わけだ
16
海外で育ったから英語が得意なわけだ。
You grew up abroad — no wonder you're good at English.
Answer
わけだ
17
長年経験があるから仕事の効率がいいわけだ。
She has years of experience — no wonder her work efficiency is high.
Answer
わけだ