Usage patterns
〈事〉の動機the motive behind an event or action
The motive behind the incident is still unknown.
動機があるto have a motive (for doing something)
He had a motive for stealing the money.
動機を探るto look into someone's motive
The police are investigating the perpetrator's motive.
〈人〉の動機を明らかにするto clarify someone's motive
Through investigation, they clarified the perpetrator's motive.
