<p>on my academic essays, it is encouraged to always use "one" instead of he or she when referring to a generic person in writing. (i.e. a hypothetical situation involving someone who doesn't exist.) is this true on the SAT essay as well? </p>
<p>also, is switching from "one" to "they" an ungrammatical change in person? if so, does that mean if you start a sentence with "one" every pronoun after that has to be "one" or "one's"?</p>