わけだ / というわけだ

毎日ギターを弾くから上手に弾けるわけだ。

I'm good at playing guitar, because I play every day.

暑いわけだ。気温が36度もある。

No wonder it feels so hot, it’s 36 degrees Celsius.

彼は日本に10年住んでいるから、日本語が上手なわけだ。

He’s been living in Japan for 10 years so no wonder he is great at Japanese.

「って、知らないわけ？」

"You mean to say you don't know?"

あんなに食べたら太るわけだ。

Eating like that it's no wonder they'd gain weight.

本当のことを言うと彼はその仕事には向かなかったわけだ。

To tell you the truth, he simply was not fit for the job.

彼女は動物が嫌いだから犬を飼ったことがないわけだ。

\n She doesn't like animals, so there's no way she's ever raised a dog.

こんなところで工事をしていたのか。渋滞するわけだ。

They are doing construction here, no wonder the roads were crowded.

渋滞　じゅうたい

(traffic) congestion; traffic jam; gridlock

このエアコンは20年間使ったのだ。それは壊れるわけだね。

This air conditioner was used for 20 years. It's no wonder it broke.

それが私たちの目的というわけです。

That is our goal.

じゃあ、あと１時間ぐらいはいられるというわけですね。

So this means you will still be around for another hour or so?

あの男と結婚するというわけだね。

In other words, you plan to marry that man?

結局は損をせずにすんだというわけだ。

The fortunate part of this was that I got off without any loss.

それで君は全ての役割をはたして、私が感謝するというわけだ。

Then you will have played your part and earned my gratitude completely.

Used when the speaker find outs the reason for situation that the speaker had been wondering

わけだ

Used to summarize or rephrase something that was previously stated by the listener or the speaker

というわけだ

初めて出会ったのが、大学１年生の時だから、あれからもう１０年になるというわけだね。

I first met when I was in the first year of college, so it's been 10 years since then.

Ａ：彼女、結婚が決まったらしいですよ。

Ｂ： なるほど、それで、最近ニコニコしているわけですね。

A: She seems to have decided to get married.

B: I see, that's why you're smiling lately.

Ａ：彼のお父さんは日本人なんですよ。

Ｂ：そうですか。日本語が上手なわけですね。

A: His father is Japanese.

B: Is that so? That's why he is good at Japanese.