Possible Clues:

• Verne's being
• To be, to Baudelaire
• Being, in Brest
• To be, in Marseilles
• Soyons is a form of it
• Infinitive of suis, sommes, etc
• 'Fusses' is a form of it
• To be, in Trois Rivieres
• Are, in Alsace
• To be, on the Left Bank