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JLPT N3Cause & Effect

～ものだから— It's Just That / Because (Excuse)

Gives a reason while emphasizing that the cause was compelling or beyond one's control — often used to explain or excuse an unavoidable result. It sounds subjective and defensive, as if pleading 'because of this, I couldn't help it'. In casual speech it shortens to ～もんだから / ～もんで.

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Pro lessonUNIT 93 · CAUSE & EFFECT

Structure · 形

[Verb/い-adj plain form] + ものだから; [な-adj / Noun] + な + ものだから

Examples · 例文

  • 電車が遅れたものだから、会議に間に合わなかった。

    Densha ga okureta mono dakara, kaigi ni maniawanakatta.

    It's just that the train was delayed, so I couldn't make the meeting.

    遅れた + ものだから = explaining an unavoidable reason for being late

  • あまりにも眠かったものだから、つい寝てしまった。

    Amari ni mo nemukatta mono dakara, tsui nete shimatta.

    I was just so sleepy that I ended up falling asleep.

    眠かった + ものだから = emphasizing an overwhelming cause as an excuse

  • 子供が病気なものだから、今日は帰らせてください。

    Kodomo ga byouki na mono dakara, kyou wa kaerasete kudasai.

    It's just that my child is sick, so please let me go home today.

    病気 + な + ものだから = な-adj/noun takes な before ものだから

Usage notes · 注意

  • Strong subjective/excuse nuance — 'it couldn't be helped'.
  • Casual: もんだから / もんで.
  • Usually for reasons already happened; not for commands/requests in the result clause with のだから feel.
  • な-adj and nouns need な (静かなものだから, 病気なものだから).

Commonly confused with

The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones ～ものだから is tested against.

vsから

ものだから stresses that the cause was compelling/beyond control (an excuse); plain から is a neutral 'because'.

vsので

ものだから is more emotional and self-justifying; ～ので is a soft, objective, polite 'because'.

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