English usage controversies

In the English language, there are grammatical constructions that many native speakers use unquestioningly yet certain writers call incorrect. Differences of usage or opinion may stem from differences between formal and informal speech and other matters of register, differences among dialects (whether regional, class-based, generational, or other), difference between the social norms of spoken and written English, and so forth.

Source: Wikipedia — English usage controversies (CC BY-SA 4.0)