It is a combination of various usages. Diversity of vocabulary French people adapt their vocabulary to their social circle, but tend to keep words related to the kitchen and cooking, from their childhood. Diversity of grammar Much more restricted. There are very few points of contention. One of them is the double compound past tense.
Many people are convinced that it is perfectly correct while just as many think it is ungrammatical.
Dictionnaries and grammars are equally split when they mention it at all. Grevisse suggests that it is limited to spoken French. In linguistics, accent is the stress placed on a syllable. Accents are referred to as varieties in pronunciation, phonological diversity or regional pronunciation. On the other hand, some people distinguish between pain and pin, pronouncing the former with a longer vowel.