The document provides examples of conditional sentences for different types of conditions. Type 1 conditional uses "if + simple present" in the if-clause and "will + infinitive" in the main clause. Type 2 conditional uses "if + simple past" in the if-clause and "would + infinitive" in the main clause. Type 3 conditional uses "if + past perfect" in the if-clause and "would have + past participle" in the main clause. It tests the reader to identify the correct pattern for a type 2 conditional.