Tendency and state
～ものだ
it is natural that ~; one should ~; used to ~ (nostalgia)
AI-written, reviewed by AI (ChatGPT)
How to form it
- Verb (dictionary form) + ものだ (general truth / advice)
- Verb (た-form) + ものだ (looking back)
- い-adjective / な-adjective + ものだ (feeling)
Register: Neutral; slightly literary
Explanation
Expresses a general truth, what is natural or proper, or the speaker's feelings when remembering the past.
In its general-truth use, the speaker talks about common sense in society. With the た-form and よく, it recalls habits of long ago. With adjectives it expresses emotion (早いものだ).
Examples
子供のころは、よく川で遊んだものだ。
こどものころは、よくかわであそんだものだ。
When I was a child, I often used to play in the river.
人は年をとると、忘れっぽくなるものだ。
ひとはとしをとると、わすれっぽくなるものだ。
People naturally get forgetful as they age.
目上の人には、敬語を使うものだ。
めうえのひとには、けいごをつかうものだ。
One is supposed to use honorific language to superiors.
時間が経つのは、早いものだ。
じかんがたつのは、はやいものだ。
How fast time passes.
Compare with
- ～べきだ: べきだ is a clear duty; ものだ is more general, a matter of common sense.
Common mistakes
- Using it for a specific one-time event.