If the document discusses the second conditional, which uses the past tense in the if clause to talk about an unreal or hypothetical situation in the present or future, and the main clause expresses the possible result using "would", "could", or "might". For example, "If the situation got worse with alcohol, I would send him to rehab" or "If there were more buses, we would/could leave the car at home."

1. SECOND CONDITIONAL
FORM
If clause Main clause
If + past tense Would/(could/might)
 FUNCTION: To talk about the possible result of a hypothetical situation in the present or
future.
 We use a past form in the conditional clause to indicate a distance from reality, rather than
indicating past time.
Examples:
 If the situation got worse with alcohol, I would send him to rehab.
 If there were more buses, we would/could leave the car at home
