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Grammar detail: もとになる

もとになる
119 words
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noun phrase + の
or
verb phrase
+
もとになる
means
become the basis for, become the foundation of (noun phrase)
じんしゅ
人種
もんだい
問題
しばしば
しゃかい
社会
ふあん
不安
もとなる
Racial problems are often the cause of social unrest.
もと is a useful term which means 'basis' or 'foundation' or 'origin'. It is actually one reading of the very common kanji 本, but given the fact that when 本 appears on its own it is far more commonly read ほん and used to mean 'book', it is customary to write もと in kana.
もと appears in several expressions such as のもとで and をもとに. Here we see another variant, in which a phrase is followed by an optional の if the phrase ends in a noun, then by もと (basis), and then になる (become).
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Kanji used in this grammar

ホン   book   もと origin   
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ジン   ニン   ひと person   
シュ    variety   たね seed   
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モン   と question   と to ask   とん wholesale   
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ダイ    topic   
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シャ    company   やしろ Shinto shrine   
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カイ   エ   あ to meet   
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フ   ブ    not   
アン   やす peaceful; cheap   
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