Possible Clues:

• To be, in Burgundy
• French I infinitive
• To be, in Brittany
• To be, to Curie
• To be, to Berlioz
• Sartre's 'L'___ et le Néant'
• Peut-___ (maybe, in Marseilles)
• Being abroad
• Raison d'___ (reason for being)
• To be, to Gigi