The document discusses the use of "as if" and "as though" in conditional sentences. It states that as if and as though are used to describe what a situation seems like or what may be true. It also discusses the use of "wish" in conditional sentences. Wish is used to express wanting reality to be different. When using wish, past verb forms are used in the noun clause, similar to conditional sentences. The document provides examples of using as if/as though and wish to talk about present, future, and past conditions.