GRAMMAR DETAIL
わけだ
Expresses a conclusion that naturally follows from facts already established.
Examples
窓がぬれている。夜の間に雨が降ったわけだ。
The window is wet. That means it rained during the night.
Words used
毎日練習しているから、上達が早いわけだ。
Daily practice explains why the improvement is so rapid.
Words used
Study notes
1. Origins, structure, and basic meaning
- Structure: Add
わけだto a plain clause to draw a conclusion that makes sense in light of known circumstances. - Basic usage:
毎日練習しているから、上達が早いわけだ。explains the rapid improvement through the fact of daily practice.
2. Common pitfalls and similar expressions
- Understanding a newly explained fact
日本で長く暮らした。日本語が上手なわけだuses a history of living in Japan to make sense of language ability. It expresses an explanatory relationship beyond the simple statement日本語が上手だ.
- Connecting nominal predicates
- A na-adjective can take
なin上手なわけだ, as can a noun in学生なわけだ. More formal explanation can use学生であるわけだ.
- A na-adjective can take