it was an accident
Je pense que c'était un accident.
I think it was an accident.
Je pensais que c'était un accident.
I thought it was an accident.
Je me fiche si c'était un accident ou non !
I don't care whether it was an accident or not!
— Cours, Lola, cours (1998)
Tom a déclaré que c'était un accident.
Tom stated that it was an accident.
Je ne crois pas que c'était un accident.
I don't think it was an accident.