Grammar Info

N3 Lesson 2: 16/22


Because, Cause

Can sound childish/cute


Verb + (んだ) + もの(1)
い-Adj + (んだ) + もの(1)
な-Adj + (なん) + + もの(1)
Noun + (なん) + + もの(1)

(1) もん


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About もの・もん

もの, an extremely common noun in Japanese that means 'thing', can also be used as a sentence ending particle. In these cases, it adds a small amount of emotion to a statement, and presents it as a reason. Due to this, もの is usually translated as 'because', or 'cause'. Literally, it just means 'it's an (A) thing!'. もの is quite casual, so should be avoided in formal situations.
To use もの as 'because', attach it to the end of the plain form of any word.
  • あなた()(こと)(なに)(しん)じられないわ。だって、あなたはいつも(うそ)つくもの
    I can't believe anything you say. Cause you always lie.
  • だって彼女(かのじょ)(わる)いんだもの
    Cause she is the one in the wrong.
  • これはあなたにあげられない大切(たいせつ)もの
    I can't give this to you, cause it is important.
  • すぐ()()まってるじゃん、まだこどもだもの
    Of course he will cry, cause he is still a child.
To emphasize もの even further, the explanatory んだ (after a verb or い-Adjective), or なんだ (after a な-Adjective or noun) will often be used.
  • エアコンつけて()ているよ。だって(あつ)くて()ないんだもの
    I sleep with the A/C on. Cause it's so hot that I can't sleep, you see.
  • この()失敗(しっぱい)する(きま)ってるでしょうまだ新人(しんじん)なんだもの
    Of course this kid will make mistakes. Cause he's still new here.
もの can be shortened to もん in its use as a sentence ending particle. However, this makes the statement sound far more 'cute' or 'childish'. Due to this, it should be avoided in standard conversation.
  • もう(なか)いっぱいだもん
    Cause I'm already full.
  • いいよ、お(まえ)もう(あそ)ばないもん
    It's all good! (Because) I'm not going to play with you anymore! (Showing mild anger/jokingly)
Fun Fact
Although it is not used regularly in standard Japanese, んですもの is a slightly more polite version of んだもの that appears frequently in anime, manga, and novels.
  • こんなものすぐに(こわ)れるに()まっているじゃないですか、(かみ)から出来(でき)てるんですもの
    Of course something like this will break instantly. (Because) it is made of paper.
  • しょうがないですよ、あの(ひと)(なに)(かんが)えていないですもの
    We can't help it. (Because) that person doesn't think about anything.


  • 彼女(かのじょ)(うそ)をついているもの

    (Because) she is lying.

  • (おこ)らないでね。子供(こども)なんだもん

    Don't be angry. (Because) he is just a kid.

  • まずいんだもん

    (Because) it tastes bad!

  • (ぼく)そう(かん)んだもん仕方(しかた)ないじゃない?

    (Because) that's how I felt. It can't be helped, right?

  • (さむ)んだもん風邪(かぜ)をひいてしまう

    (Because) it's freezing. I'm gonna catch a cold, man!

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もの・もん – Grammar Discussion

Most Recent Replies (10 in total)

  • shary


    Good news everyone.

    We can add a video from Japanese Ammo with Misa (Make Excuses & Justify Yourself Like the Japanese もん/もの/んだもん!JLPT N2 - YouTube) in the readings for this grammar point and also

  • FredKore


    The Information section of the grammar page needs to be cleaned up. The words “because” and “cause” are not the same meaning. When “because” is shortened in casual conversation, an apostrophe is used to show the contraction:
    do not → don’t
    should not → shouldn’t
    because → 'cause

    Without the contraction apostrophe, the word “cause” is a different meaning.

    'cause Definition & Meaning - Merriam-Webster
    Cause Definition & Meaning - Merriam-Webster
    Because Definition & Meaning - Merriam-Webster
    (notice the Synonym section for “because” includes “'cause”)

  • bokudake


    Is なだもの wrong? Because it sounds unnatural?

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