The document discusses the first conditional, which is used to talk about possible situations in the present or future. The first conditional uses an "if" clause with a simple present verb and a main clause with "will" plus a verb. Some examples are provided to illustrate possible situations, such as "If it's sunny, we'll go to the park" and "If you cook the supper, I'll wash the dishes." The document also provides exercises for readers to practice forming first conditional sentences on their own.