Occurrence in formal register.
Formal French prefers survenir or se produire for events: « un incident est survenu ». Arriver in that sense reads as conversational, so official statements avoid it.
The phrase en arriver à means to reach the point of: « on en arrive à se demander si… ». It is a standard connector in argumentative writing.
💡 Focus at this level: Literary & formal
1. « Survenir » for formal events. Incidents, complications.
2. « En arriver à » builds an argument toward a conclusion.
3. Recognise « il arriva ». Past historic.
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