Learn Japanese grammar: ものだ (mono da). Meaning: normally; in general; should~; must~.
When speaking, it is often shortened to もんだ (mon da).
Meaning 1 – normally; in general
This is used to express something considered to be common knowledge.
See examples 1~4.
Meaning 2 – should~; must~
This form can only be used with verbs.
To say “should not” or “must not”, change to ものじゃない (mono janai).
See examples 5~8.

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ものだ - Example Sentences 例文
Each example sentence includes a Japanese hint, the romaji reading, and the English translation.
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Example #1
人は誰でも間違いをするものだ。
Example #2
人は見かけでは分からないものだ。
Example #3
人は誰でも失敗するものです。
Example #4
たくさん運動したら疲れるものです。
Example #5
子供は早く寝るもんだよ。
Example #6
人の悪口は言うものじゃない。
Example #7
お年寄りには優しくするものだ。
Example #8
知らない人を簡単に信じるもんじゃないよ。
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