Explanation
Express a logical conclusion or reason; 'it means', 'no wonder', 'the reason is'.
Formation
Verb-casual + わけだ, い-Adjective + わけだ, な-Adjective + なわけだ, Noun + のわけだ
Detailed explanation
The ～わけだ grammar point is used to express a logical conclusion or reason. It can be translated as 'it means...', 'no wonder...', or 'that explains why...'.
Examples
Kanojo ga okureta no wa, densha ga okureta wake da.
The reason she was late is that the train was delayed.
Jugyou ga omoshirokatta kara, minna nesshin ni kiiteita wake da.
The class was interesting, so that's why everyone was listening intently.
Kare wa totemo isogashii desu kara, yasumi ga hotondo nai wake da.
He's really busy, which is why he hardly has any time off.
Kono mondai ga muzukashii kara, zenzen wakaranai wake da.
This problem is tough, so no wonder I don't understand it at all.
Practice
Grammar content sourced from hanabira.org.