connective N2 common casualpolitewritten
〜ものだから — because ~
〜ものだから ・ ものだから
Builds on もの
Meaning
- because ~ (you see) / it's just that ~ — gives a reason as an explanation or excuse, stressing it as the unavoidable cause
Key sentence
あまりに眠かったものだから、つい寝坊してしまった。
It's just that I was so sleepy, I ended up oversleeping.
Formation
| Attaches to | Form | Example |
|---|---|---|
| Plain-form clause (na-adjな・Nな) + ものだから | [clause] + ものだから | 急だったものだから / 子供が小さいものだから |
Examples
道が混んでいたものだから、約束に遅れてしまった。
The roads were jammed, you see, so I ended up late for our appointment.
あの店は安いものだから、つい買いすぎる。
That shop is so cheap that I always end up buying too much.
Easily confused with
から から states a reason plainly; ものだから presents it as a *compelling, beyond-my-control* cause — typically to justify or excuse an outcome the speaker didn't intend, and the result clause is usually past/unintended, not a request or command. ので ので gives an objective reason softly; ものだから leans subjective and excuse-like, foregrounding 'the reason it happened was, honestly, that ~'.
Notes
- Often shortens to 〜もんだから in casual speech. The polite explanatory variant is 〜ものですから. It doesn't lead to commands or requests — only to a consequence being accounted for.
See 〜ものだから in real sentences
Jengo shows 〜ものだから the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.