Components
ことになる is an exact match with one form of the following word:
事になる
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Reading : ことになる   
expression, 'ru' godan verb
1. it has been decided (so) that; it has been arranged (so) that  (usu. sentence ending; often written with kana only)
2. it is the result (of); it is the outcome  (often written with kana only)
3. it is the reason (for)  (often written with kana only)
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Usefulness and usage:
Kanshudo usefulness level: 9 (among the 50,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 49,586 which gives a rank of 28,060
事になる is the most useful form. 1 additional form is shown below.
• This form is used about 60% of the time
• Google Japan frequency rank: 7,000 (about 123,000,000 results)
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Example sentences:
わたし
えんぴつ
鉛筆
じっぽん
10本
った
そのうち
はんぶん
半分
おとうと
あた
える
こと
になっていた

I bought ten pencils, half of which were to be given to my brother.
にじっせいき
二十世紀
こうはん
後半
さいしょ
最初
とし
さいしょ
最初
つき
さいしょ
最初
しゅう
ということになる
That makes it the first week of the first month of the first year of the second half of the 20th century.
Source: 国境の南、太陽の西 村上春樹, translation by Bunsuke)
いやおうなく
かのじょ
彼女
ふざい
不在
おも
たる
ことになった
It meant that I was forced to think about her absence.
ことになる
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My flashcards:
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Usefulness and usage:
• This form is used about 40% of the time
• Google Japan frequency rank: 9,000 (about 89,300,000 results)
• Routledge most useful 5000 words rank: 326
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ジ   ズ   こと thing; matter   
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