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The document discusses different types of "if clauses" in English grammar. It explains that a second conditional refers to something that is unreal, hypothetical or imaginary in the present. A third conditional refers to something that is impossible and expresses a hypothetical situation in the past. It emphasizes that to form the past tense of "to be" in a second conditional, the verb is always "were" rather than "was", and a third conditional uses the past perfect tense.











