のもとになる

become the cause or source of; lead to

→ の

phrase Rare #36,708

become the cause or source of; lead to Used when something causes or leads to a result, often a negative one. It can also mean “become the basis or source of” something. The exact form のもとになる is the non-past form; the verb changes tense as needed, such as のもとになった.

JA: スピードの出し過ぎはしばしば自動車事故のもとになる。

EN: Excessive speeding often causes car accidents.

面倒のもとになるだけだ

It'll only cause trouble.

— ラストエンペラー (1987)

スピードの出し過ぎはしばしば自動車事故のもとになる。

Speeding is often the cause of car accidents.

人種問題はしばしば社会不安のもとになる。

Racial issues are often a source of social unrest.