もの / もん

About

At the end of a sentence, もの is a casual, feminine way to add emphasis to a statement. もの is often used when someone is making an excuse, or justifying something.

E.g. このドラマ、見みるのをやめられない。すごく面白おもしろいもの。 "I can't stop watching this drama. It's just so interesting."

もの can be shortened to もん, which is casual, and sounds girly. It is gender-neutral for kids, however.

E.g. だって暇ひまだもん。 "'Cuz I'm bored."

〜ですもの is also possible. This pattern has the same usages as 〜もの・もん, but lacks any childish nuance. 〜ですもの sounds like something a sophisticated, older lady might say.

E.g. 絶対ぜったい開あかないわよ。スティーブが閉しめたんですもの。 "There's no way I can open it. Steve was the one who closed it after all."

Summary

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  もの is a casual, feminine way to add emphasis to a statement

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  もの is often used when someone is making an excuse, or justifying something

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  もの can be shortened to もん

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  もん sounds girly for adults, but is gender-neutral for kids

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  〜ですもの lacks any childish nuances, and is generally used by older "sophisticated" women