If clauses are conditional sentences consisting of a condition and a result. They are divided into four main types: Zero, Type 1, Type 2, and Type 3. Each type serves a specific purpose in expressing different levels of possibility or hypothetical situations.
Key points:
- Zero Type: Used for general truths and scientific facts
- Type 1: Expresses real possibilities in the present or future
- Type 2: Describes unreal or imaginary situations in the present
- Type 3: Refers to unreal situations in the past
- Mixed Types: Combine different types for complex hypothetical scenarios