〜ものだ has three main uses depending on context:
Nostalgia (past tense) - Reminiscing about things you used to do
General truth - Stating what''s natural, expected, or common sense
Advice/expectation - What one should do or how things should be
Casual form: もんだ
See examples below for varied real-world usage.
Past + ものだ = nostalgia (used to)
Present + ものだ = general truth / advice
Casual: もんだ (very common in speech)
Promises should be kept.
I used to come here a lot back then.
In everyday context, Promises should be kept.
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