1.
because; the thing is; you see
Sentence-ending particle used to give a reason or excuse, often with a slightly childish or emotional tone. Common in casual speech.
2.
it is natural that; that's just how things are
Used to express that something is natural, expected, or a general truth. Often in the form ものだ.
Usage
- Sense 1 (reason, excuse): casual, with a childish or pouting tone; often paired with だって (but…) and shortened to もん in very casual speech: 寒いんだもん.
- Sense 2 (ものだ): states what is natural or to be expected, in a neutral tone. After a past verb with よく it recalls a past habit: 昔はよくここで遊んだものだ (I often used to play here).
Related words
- ものの: conjunction meaning "although"
- ものだから / もんだから: because (a clause connector, often for explaining or excusing)
Watch out
- The particle is not the noun 物 (thing), though it comes from it; written in kana, the two look the same.