This is the 11778th most frequent French word.
soudainement
Suddenly.
Here, 'soudainement' is used at the beginning of the sentence to set up the unexpected occurrence of heavy rain.
Soudainement, il s'est mis à pleuvoir très fort.
Suddenly, it started raining heavily.
Here, 'soudainement' is an adverb modifying 'décidé,' indicating that the decision to go on vacation was made abruptly.
Il a soudainement décidé de partir en vacances.
He suddenly decided to go on vacation.
In this sentence, 'soudainement' is an adverb modifying 'disparu,' emphasizing the unexpected and rapid nature of the light's disappearance.