GrammarN12 min read2026-02-17

〜も同然だ

Expresses that a situation is practically the same as something else.

Meaning

This pattern expresses that a situation is practically the same as another. It is used to say that something is equivalent to or no different from the stated comparison.

Formation

Part of speechFormation
Verb (た-form)も同然だ/も同然の
Nounも同然だ/も同然の

Examples

  1. ともちゃんはおしゃべりだから気をつけた方がいいよ。あの子に秘密を打ち明けたら、学校のみんなに秘密を明かしたも同然なんだから。
    Tomo is a chatterbox, so you should be careful. If you tell her a secret, it is as good as telling the secret to everyone at school.

  2. 彼とは幼稚園に入る前から一緒に遊んでいるので、兄弟も同然だ。
    I have been playing with him since before kindergarten, so we are practically brothers.

  3. 国の信用が失墜し、インフレが進行したら、さくらんぼさんに言えば一万円札だって紙くずも同然だ。
    If the country's credibility collapses and inflation progresses, to put it bluntly, even a 10,000-yen bill would be as good as scrap paper.

Summary

  • 「〜も同然だ」 means "as good as...; practically the same as..."
  • Attaches to verbs in た-form and nouns

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