ものだ

Used To/should (General)

Level 3Sounds Like monoda

ものだ is a versatile expression used to state how things naturally are, how people should (or shouldn't) behave, to express strong desires, to reminisce about the past, or to give reasons and excuses.

How It Works

ものだ (often shortened to もんだ in casual speech) has five primary functions:

1. General Truths / Nature of Things: Used to state a universal fact or a natural tendency. It implies 'that's just how the world works.' The negative form ものではない (or もんじゃない) is also used here to express 'that's not how the world works' (e.g., 人生は甘いものではない - 'Life isn't that easy').

2. Social Norms / 'Should': Used to express common sense or social expectations. Unlike 〜べきだ, which can be used for specific, immediate advice to an individual, ものだ is strictly for general, universal rules (e.g., 'People should go to the doctor when sick') and appeals to shared wisdom. To say 'should not,' use ものではない (or the casual もんじゃない, which is frequently used when scolding or giving advice).

Important Note for Functions 1 & 2: Because these express general truths or universal rules, you cannot use a specific person or item as the subject. For example, you can say 「学生は勉強するものだ」 (Students should study), but you cannot say 「田中さんは勉強するものだ」 (Tanaka should study). Also, do not use either ものだ or べきだ to give advice to superiors (目上の人), as both sound preachy and condescending.

3. Deep Emotion / Strong Desire: It can express deep emotion or exclamation (感慨) when used with verbs, adjectives, or the past tense (e.g., 早いものだ - 'How time flies', よく頑張ったものだ - 'You really worked hard'). It is frequently paired with adverbs like なんと, どんなに, どれほど, or よく. When paired with 〜たい, 〜てほしい, or 〜てもらいたい, it expresses a strong, heartfelt wish.

4. Past Habits (Nostalgia): When paired with the た form, it describes a repeated action in the past that the speaker recalls with emotion. It is almost universally taught alongside the adverb よく (e.g., よく〜たものだ).

5. Reason / Excuse: Often used with だって and ending in んだもの or もん (casual), it expresses a reason or excuse, sometimes with a slight tone of justification or childishness. While 〜もの and 〜んだもの are strongly associated with feminine speech, the casual 〜もん and 〜んだもん are used by both men and women in casual speech, as well as by children.

Note: This grammar is the foundation for related advanced conjunctions like ものだから (because/reason) and ものの (although/even though).

Formulation:

Functions 1 & 3 (General Truths, Emotion):

  • Verbs: Dictionary form / ない form / た form / ている + ものだ / ものではない
  • い-Adjectives: Dictionary form + ものだ
  • な-Adjectives: な / である + ものだ
  • Nouns: Noun + というものだ (Note: Nouns cannot attach directly to the standard ものだ pattern for these functions. At advanced levels, they can attach directly to express 'worth/value', e.g., ノーベル賞ものだ).
  • Strong Desire (Function 3): たい / てほしい + ものだ

Function 2 (Social Norms / 'Should'):

  • Verbs: Dictionary form / ない form + ものだ / ものではない

Function 4 (Past Habit):

Function 5 (Reason / Excuse):

  • Verbs / い-Adjectives: Plain form + (ん)だもの / (ん)だもん
  • Nouns / な-Adjectives: なんだもの / なんだもん

Examples (6)

  1. 人は誰でも間違えるものだ。

    It is only natural for humans to make mistakes.

    Word by Word: Person as-for anyone make-mistakes thing is.

    This expresses a general truth about human nature.

  2. お年寄りには親切にするものですよ。

    One should be kind to the elderly.

    Word by Word: Elderly to as-for kindness do thing is (polite).

    This expresses a social norm or common sense expectation.

  3. 「どうして食べないの？」「だって、嫌いなんだもん。」

    "Why aren't you eating?" "Because I hate it."

    Word by Word: Why eat-not? Because, hate is-thing.

    Using んだもん (casual for のだもの) expresses a reason or excuse, often with a slightly childish or defensive tone.

  4. 子供の頃は、よくこの公園で遊んだものだ。

    I used to play in this park often when I was a child.

    Word by Word: Child's time as-for, often this park at played thing is.

    Using the た form indicates a nostalgic habit from the past.

  5. 一度でいいから、宇宙に行ってみたいものだ。

    I'd really love to go to space, even just once.

    Word by Word: One-time even-if good because, space to go-want thing is.

    When paired with たい, it expresses a strong, heartfelt desire.

  6. それが人生というものだ。

    That is what life is all about.

    Word by Word: That as-for life called thing is.

    For nouns, the pattern というものだ is used to define the essence of something.

Common Mistakes

  • Using it for specific personal routines.

    私は毎朝コーヒーを飲むものだ。
    私は毎朝コーヒーを飲むことにしている。

    ものだ is for universal truths or social norms. For personal habits or decisions, use ことにしている.

  • Using the past habit form for one-time events.

    昨日は学校に行ったものだ。
    昨日は学校に行った。

    たものだ is only for repeated habits that you feel nostalgic about. For a simple past action, just use the standard た form.

How It Connects

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ものだLevel 3Used To/should (General)

Learn This First

To understand 'ものだ', you first need to know how to conjugate verbs into the plain past (た form) for expressing past habits. You also need to understand the basic grammar of noun modification, as 'もの' is a formal noun being described by the preceding phrase, and the use of the copula 'だ' to end the sentence.

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