～ものだ

About

When it comes at the end of a sentence, the ～ものだ (or ～ものです) pattern has four possible usages: Expressing general facts, giving advice based on common sense/custom, exclamatory statements, and nostalgic statements.

E.g. 猫ねこはよく寝ねるものだ。 "Cats sleep a lot."

E.g. 病気びょうきの時ときは、仕事しごとを休やすむものだ。 "When you're sick, you shouldn't go to work."

E.g. 時ときが経たつのは早はやいものだ。 "Time passes so very quickly."

E.g. 昔むかし、この川かわで子こども達たちが泳およいだものだ。 "Back in the day, children used to swim in this river."

In spoken Japanese, もの often becomes もん.

E.g. マイクに、あのラーメンを食たべてほしいもんだ。 "I really want Mike to eat that ramen."

Summary

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  ものだ can express general facts

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  ものだ can give general advice

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  ものだ can form exclamatory statements

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  ものだ can form nostalgic statements

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  もの often becomes もん in spoken Japanese