Among themselves they speak a nasal, old-fashioned French, accented in a way that reminds visiting Parisians of French-Canadian speech.
Their nasal French can be difficult for Parisians to understand.
mnli hypothesis: Their nasal French can be difficult for Parisians to understand. premise: Among themselves they speak a nasal, old-fashioned French, accented in a way that reminds visiting Parisians of French-Canadian speech.