GrammarN32 min read2026-02-17

〜せいで/せいだ/せいか

Grammar pattern expressing undesirable consequences caused by someone or something

Meaning

〜せいで/せいだ/せいか expresses that an undesirable or negative result occurred because of someone's action or a certain condition. Unlike おかげで (which indicates positive outcomes), this pattern emphasizes negative consequences and places responsibility on someone or something else. 〜せいか specifically indicates uncertainty about what caused the negative result.

Formation

Part of speechFormation
动词普通形せいで/せいだ/せいか
い形容词せいで/せいだ/せいか
な形容词 なせいで/せいだ/せいか
名词 のせいで/せいだ/せいか

Examples

  1. 気温が高いせいで、ポケットの中のチョコレートが溶けた。
    The chocolate in my pocket melted because of the high temperature.

  2. 近所がうるさかったせいで、昨日は眠れなかった。
    I couldn't sleep last night because the neighborhood was too noisy.

  3. 彼女は悲しいことを考えているせいか、あそこでこっそり泣いている。
    She seems to be quietly crying there, perhaps because she's thinking about something sad.

  4. 今回、試合に負けたのは、全部君のせいだ。
    We lost this match entirely because of you.

Summary

  • Used to express negative or undesirable results caused by external factors or someone else's actions
  • Takes the form: verb/i-adjective/na-adjective な/noun の + せいで/せいだ/せいか
  • 〜せいか is used when the cause of the bad result is uncertain or unclear

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