〜ものだ

import { getGrammarById } from 'kotowa';
getGrammarById('mono-da');

{
  "id": "mono-da",
  "pattern": "〜ものだ",
  "romaji": "mono da",
  "level": "N3",
  "meaning": "it's natural that; one should; used to (nostalgia); how ...! (deep feeling)",
  "formation": "Verb-dict / Verb-ta / i-Adj / na-Adj + な + ものだ",
  "examples": [
    {
      "ja": "子どものころは、この川でよく泳いだものだ。",
      "furigana": "{子|こ}どものころは、この{川|かわ}でよく{泳|およ}いだものだ。",
      "en": "When I was a child, I used to swim in this river a lot."
    },
    {
      "ja": "新しい環境に慣れるには、時間がかかるものだ。",
      "furigana": "{新|あたら}しい{環境|かんきょう}に{慣|な}れるには、{時間|じかん}がかかるものだ。",
      "en": "It naturally takes time to get used to a new environment."
    },
    {
      "ja": "目上の人には敬語を使うものだ。",
      "furigana": "{目上|めうえ}の{人|ひと}には{敬語|けいご}を{使|つか}うものだ。",
      "en": "You're supposed to use honorific language with your superiors."
    }
  ],
  "tags": [
    "recollection",
    "advice",
    "tendency"
  ],
  "notes": "Main uses: general truth or natural tendency, a social norm (should), a nostalgic past habit with 〜たものだ, and deep feeling (時間がたつのは早いものだ). Casual: 〜もんだ.",
  "zh": {
    "status": "reviewed",
    "source_hash": "caaf3bef434d9931bc18d67bcaa85db8a684c66f000888f6580a5118aa7b1e05",
    "meanings": [
      "本来就是",
      "应该",
      "过去常常",
      "真是"
    ],
    "formation": "动词辞书形／た形／い形容词普通形／な形容词词干＋な＋ものだ",
    "explanation": "表示一般规律、社会常识，也可用たものだ回忆过去习惯，或表达感慨。",
    "notes": "口语可说もんだ；含义需结合上下文。",
    "examples": [
      {
        "ja": "子どものころは、この川でよく泳いだものだ。",
        "zh": "小时候，我经常在这条河里游泳。"
      },
      {
        "ja": "新しい環境に慣れるには、時間がかかるものだ。",
        "zh": "适应新环境自然需要时间。"
      },
      {
        "ja": "目上の人には敬語を使うものだ。",
        "zh": "对长辈或上级应该使用敬语。"
      }
    ],
    "references": [
      "sources/grammar/n3.json#mono-da",
      "Original Chinese authored and reviewed by Codex; no independent human review"
    ],
    "reviewer": "Codex",
    "review_method": "ai",
    "reviewed_at": "2026-10-28",
    "review_hash": "6f211253261319deb0e6c644bb2da961308446ff6e37a0641ff2e873ccba3530"
  }
}