Conditionals
If clauses and conditional sentences
Zero Conditional
General truths and facts: If/When + present, present
First Conditional
Real/likely future results: If + present, will + base verb
Second Conditional
Unreal or unlikely present/future results: If + past, would + base
Provided That and As Long As
Conditional alternatives emphasizing conditions and requirements
Unless in Conditionals
Using 'unless' as a negative conditional meaning 'if not'
Third Conditional
Unreal past results: If + past perfect, would have + V3
Mixed Conditionals
Combining different time frames: past condition → present result or present condition → past result