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Section 1 of 4
Zero Conditional (General Truths and Facts)
Used for scientific facts, general truths, and habits. Both clauses use present tense.
✓ Rules
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Structure: If + present simple, present simple
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Use for: facts, scientific laws, general truths, automatic consequences
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'When' can replace 'if' in Zero Conditional without changing meaning
Examples
3✓
Correct
If temperatures rise, ice caps melt.
Scientific fact
✓
Correct
If governments invest in education, economic productivity increases.
General causal truth
✓
Correct
When air quality deteriorates, respiratory illnesses become more common.
'When' = 'if' in Zero Conditional