This document discusses different types of conditionals in English: - Zero conditional expresses general truths using present tense (if it rains, I get wet) - First conditional expresses possible future situations using present/will (if I study, I'll pass the exam) - Second conditional expresses improbable or imaginary situations using past/would (if I were rich, I would travel) - Third conditional expresses regret about past situations using past perfect/would have (if I had studied, I would have passed)