This document discusses the first conditional, a grammatical structure used to talk about possible situations in the present or future. The first conditional has two clauses: an "if" clause using the present simple tense, and a main clause using "will" or another modal verb. Some examples of how the first conditional is used include making predictions about what may happen, expressing superstitions, and making future plans contingent on certain conditions. Other modal verbs like "should", "can", and "might" can also be used instead of "will" in the main clause.