Grammar Info

N3 Lesson 10: 5/20


Because of, Due to, Blame

Can express blame or fault, で can be omitted at the end of a sentence


Verb + せい
[い]Adjective + せい
[な]Adjective + + せい
Noun + + せい


  • Register


  • 使用域


About せいで

Although written almost exclusively in hiragana, せい is a noun that may be better understood from its kanji, 所為(せい), meaning 'doings'. せい is used to convey negative results that occurred due to the behavior or actions of another person/thing. Because of this, common translations of せい are 'fault', 'due to', or 'because of'.
As せい is a noun, it may be used after the attributive form of any other word. The case marking particle で will also regularly be seen after せい, especially when conveying the (B) result that occurred 'with' or 'by means of' those 'doings'.
  • 昨日(きのう)(よる)(おそ)まで()ていたせいで寝坊(ねぼう)した。
    Because I stayed up late last night, I overslept today.
  • (そと)(さむ)せいで風邪(かぜ)()いた。
    Because it is chilly outside, I caught a cold.
  • (いぬ)手術(しゅじゅつ)(こと)心配(しんぱい)せいで今日(きょう)()れなさそう。
    Due to me being worried about my dog's surgery, it doesn't seem like I am going to be able to sleep.
  • 大雪(おおゆき)せいで(みち)渋滞(じゅうたい)してる。
    Because of the heavy snow, the road is congested.
Fun Fact
The 'doings' that 所為(せい) represents is similar to the negative 'doings' that is used in English to place blame. This can be seen in phrases such as 'it was the weather's doings', or 'ah, so the missing cookies were your doings!'
  • 遅刻(ちこく)した渋滞(じゅうたい)せい
    Me being late is the traffic's doing!
  • 台風(たいふう)せいでまた予定(よてい)()わったよ。
    Due to the typhoon's doings, my plans have changed again.



  • トムは(あつ)せいで()(うしな)った。

    Tom passed out because of the heat.

    • トムが(さら)()ってしまったせいで(わたし)怪我(けが)をしてしまった。

      I got injured because Tom broke a plate.

      • 気分(きぶん)(わる)くなったせいで仕事(しごと)(やす)んでしまった。

        Because I wasn't feeling well, I took the day off.

        • (あめ)せいでせっかくの遠足(えんそく)中止(ちゅうし)になってしまった。

          The long awaited trip was cancelled because of the rain.

          • 湿気(しっき)せいでカビがひどい。

            The mold is out of control because of the humidity.

            • Get more example sentences!

              Premium users get access to 12 example sentences on all Grammar Points.

            Self-Study Sentences

            Study your own way!

            Add sentences and study them alongside Bunpro sentences.

            せいで – Grammar Discussion

            Most Recent Replies (2 in total)

            • narfi


              Isn’t the grammar description missing the case where せい is followed by だ/です? Apparently, the particle で is not allowed in that case, whereas the grammar summary indicate that it is required there:

              ✗ ~せいででしょう。

            • mrnoone



              It is not allowed here, because で in せいで is てform of a noun/なadjective, and the てform is used to connect parts of the sentence (clauses). When せい is used at the end of the sentence (so-called predicate position), there is no other part that will be joined so てform is not needed and as with any other noun/なadjective だ・です・and so on follow.

              I will fix the structure section so it will be more clear

              I hope it helps!

            Got questions about せいで? Join us to discuss, ask, and learn together!

            Join the Discussion