InitialJ
N2obligationexpectation

～ものだ (mono da) - Should / Ought to

[Verb dictionary form] + ものだ

Quick answer

[Verb dictionary form] + ものだ means "Should / Ought to / It's natural to". As a N2 grammar point, it is tested in the JLPT. Detailed examples and a usage explanation are on this page.

Meaning

Should / Ought to / It's natural to

Explanation

Expresses general truth, moral obligation, or what is expected.

Examples

親を大切にするものだ。
おやをたいせつにするものだ。
One should cherish their parents.
親—Parent大—Big
約束は守るものです。
やくそくはまもるものです。
Promises should be kept.
約—Promise束—Bundle守—to protect

Practice this grammar

[Verb dictionary form] + ものだ

Which sentence correctly uses "～ものだ (mono da) - Should / Ought to"?

Vocabulary from these examples

約PromiseN3守to protectN3束BundleN3守Guard親Parent大Big約Approximately束Bunch

Last updated Jul 4, 2026