Mimi Kara Oboeru N3 Grammar – わけだ (wakeda)

Mimi Kara Oboeru N3 Grammar – わけだ (wakeda)
Here is Japanese N3 grammar study material taken from the Mimi Kara Oboeru N3 textbook.

81. ～わけだ
a. Structure: [V/A] noun-modifying form + わけだ
b. Meaning 1: for various reasons, it naturally follows that ~

消費税は５％だから、１０５０円払ったら、５０円は税金というわけだ。
Shōhizei wa 5-pāsentodakara, 1050-en harattara, 50-en wa zeikin to iu wakeda.
Consumption tax is 5%, so if you pay 1,050 yen, naturally 50 yen of that is tax.

私は毎日８時間寝ている。つまり、人生の３分の１をベッドで過ごすわけだ。
Watashi wa mainichi 8-jikan nete iru. Tsumari, jinsei no 3-bun’no 1 o beddo de sugosu wakeda.
I sleep eight hours a day. In other words, I spend a third of my life in bed.

c. Meaning 2: understanding the reason and accepting it = はずだ

（テレビが）つかないわけだ。コンセントが抜けている。
(Terebi ga) tsukanai wakeda. Konsento ga nukete iru.
It is unplugged. No wonder the TV will not turn on.

足が速いわけだ。彼は元陸上選手だったのだそうだ。
Ashi ga hayai wakeda. Kare wa moto rikujō senshudatta noda sōda.
I hear he used to be a track athlete. No wonder he is so fast.

「マリアさんのお母さんは日本人なんだって」「どうりでマリアさんは日本語の発音がきれいなわけだね」
`Maria-san no okāsan wa nihonjin’na n datte’`dōride Maria-san wa nihongo no hatsuon ga kireina wakeda ne’
I hear Maria’s mother is Japanese – No wonder Maria speaks Japanese so well.

c. Meaning 3: explaining a reason, drawing a conclusion.

医学が発達し、乳児死亡率も下がった。それで平均寿命も伸びたわけだ。
As medicine has advanced, infant mortality has fallen. That is why average life expectancy has risen too.

都会では一人暮らしの人が増えた。生活時間も不規則になった。それでコンビニが増えたわけだ。
In cities more people live alone. Their daily hours have become irregular too. That is why the number of 24-hour convenience stores has grown.

「大学卒業後は帰国するつもりでしたが、先生にいい就職先を紹介され、そこで今の妻と出会い、日本に住み続けることになったわけです」
I meant to go home after graduating, but thanks to my teacher introducing me to a good job, I met my wife and have stayed on living in Japan.