What is the first conditional used for?

The first conditional is used to talk about real and possible situations in the future. This grammatical structure typically focuses on events that are likely to happen if a certain condition is met. It is formed using "if" plus the present simple tense in the conditional clause, followed by "will" plus the base form of the verb in the main clause.

For example, saying "If it rains, I will stay indoors" indicates a realistic possibility that could occur in the future based on the condition of it raining. This makes the first conditional particularly useful for discussing future outcomes that are dependent on specific circumstances.