This document discusses the use of the past tense conditional (if-clause) with "would + infinitive" in the main clause. It is used to talk about present or future situations that are unlikely or hypothetical, such as saying "If I had $200,000 now, I would buy a car" or "If I were you, I wouldn't do this." The past tense "were" is often substituted for "was" in the first and third person singular in the if-clause.