Zero conditional for scientific facts, general truths, and things that are always true
Q1. If you heat water to 100°C, it ___
Zero conditional uses present simple in both clauses. Facts are immutable. Science proceeds.
Q2. When it rains, the grass ___ wet
Present simple describes inevitable results. Rain falls. Grass responds. Nature functions.
Q3. If you ___ hungry, you eat
Zero conditional expresses universal habits. Hunger strikes. Food is consumed. Biology persists.
Q4. When winter comes, the days ___ shorter
Seasonal changes are predictable. Winter arrives. Days shorten. Earth tilts.
Q5. If you mix blue and yellow, you ___ green
Colour mixing follows rules. Pigments combine. Green emerges. Art observes.