“Every student should do the best they can.”
If you’re a grammar purist, that sentence may have made you cringe.
Standard English dictates the word “they,” a plural pronoun, should never be used to refer to a single person. Since “student” is a singular noun, you’d need a singular pronoun like “he” or “she” to match it.
A high school English teacher, however, wrote a convincing argument about why he’ll no longer mark that usage as incorrect in his students’ essays. His decision could reflect a dramatic shift in the English language.