What exactly does “The Chinese language” mean? Does it mean Mandarin, or are other langs like Cantonese, Hakka, and Teochew included?
3 points
The difference between it being a rule and an exception depends on which side of the North/South dividing line a speaker is from. Generally, people from south and south-east of the Yangtze river speak languages whose most recent common ancestor is Middle Chinese and not Mandarin.
Here’s a map of the Sinitic languages and a map of the varieties of Mandarin.