The document discusses conditionals and their structures. There are three main types of conditionals - first, second and third. The first conditional uses the present tense to talk about possible present or future situations. The second conditional uses past tense to talk about hypothetical present or future situations. The third conditional uses past perfect tense to talk about hypothetical past situations. The document provides examples of sentences for each conditional type and their typical structures.

1. CONDITIONALS

2. CONDITIONALS WHAT ARE CONDITONALS? A way of expressing possible or hypothetical situations WHEN? If or Unless WHAT DO ALL CONDITIONAL CLAUSES INCLUDE? The First, Second and Third Conditional WHAT ARE THE MAIN CONDITIONALS? In the past, present and future.

21. LET’S PRACTICE!