Learn Japanese grammar: ことになっている (koto ni natteiru). Meaning: to be expected to; to be scheduled to; it has been decided as a rule that.
This is often used to explain set rules.
You can also use ことになっています (koto ni natteimasu) to be more formal.

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ことになっている - Example Sentences 例文
Each example sentence includes a Japanese hint, the romaji reading, and the English translation.
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Example #1
この図書館では2週間まで本が借りられることになっています。
Example #2
日本では、車は左側を走ることになっている。
Example #3
授業中は、携帯電話を使ってはいけないことになっている。
Example #4
60点以上が合格ということになっている。
Example #5
この部屋には、関係者以外入ってはいけないことになっている。
Example #6
燃えるゴミは、毎週の月曜日と木曜日に捨てることになっています。
Example #7
この会社では、毎朝、仕事の前にラジオ体操をすることになっている。
Example #8
試験用紙は持ち帰ってはいけないことになっている。
Example #9
休むときは学校に連絡しなければならないことになっています。
Example #10
JLPTN2は90点以上が合格ということになっている。
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