English grammar
Dialects of English vary not only in pronunciation but in grammar too.  For example, people who use what is called General American English or Received Pronunciation might say, “I didn't do anything,” while someone who speaks what is called African American Vernacular English might say, “I didn't do nothing,” and a working class Londoner who speaks Cockney English might say, “I ain't done nuffink.” The dialect a person speaks with is usually decided by where they live and their socioeconomic background.