〜もの: meaning and usage

How to form it

• verb (plain form)/い-adjective+もの/もん
• noun/な-adjective (stem)+だ+もの/もん
• verb (plain form)/い-adjective+んだ+もの/もん
• noun/な-adjective (stem)+なんだ+もの/もん

How it is used

A sentence-final reason used to justify oneself, often with 「だって」 and usually said as 「もん」. It can sound childish or sweet, so it is not used in formal settings. More casual than 「〜ものだから」.

Examples

1. 「 こんなに買い物したの？ 」 「 だってセールだもの。」

   "You shopped this much?" "It's because of the sale."

2. もう歩けないよ。足が痛いんだもん。

   I can't walk any more. My feet hurt!

3. ケーキは半分だけにしておく。もう夜遅いもの。

   I'll just have half the cake. It's late, after all.