BBC World Service. 410 Grammar: Third Conditional. The third conditional (also called conditional type 3) is a structure used for talking about unreal situations in the past.
This page will explain how the third conditional is formed, and when to use it. The structure of a third conditional sentence Like the other conditionals, a third conditional sentence consists of two clauses, an “if” clause and a main clause: Explanation: I failed the exam, because I didn't study hard enough. Grammaring – The web of English grammar. Mixed Tenses: hypothetical situations in mixed time frames.