1. Zero Conditional:

Structure:

• If + present simple, present simple.

Usage:

• Used for general truths, facts, or situations that are always true.

Example:

• If you heat ice, it melts.
  • In this case, it's a fact that heating ice always leads to melting.

2. First Conditional:

Structure:

• If + present simple, will + base form of the verb.

Usage:

• Used to talk about real or likely situations in the future, where there is a cause-and-effect relationship.

Example:

• If it rains tomorrow, we will stay indoors.
  • This talks about a possible future event (rain), and the likely consequence (staying indoors).

3. Second Conditional:

Structure:

• If + past simple, would + base form of the verb.

Usage:

• Used to talk about hypothetical or unreal situations in the present or future.

Example: