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Expressing general truths, facts and habitual results.
The Zero Conditional describes situations in which one condition regularly or invariably produces a particular result.
It is commonly used for general truths, facts, rules, habits, and predictable relationships.
The Zero Conditional commonly uses the Present Simple in both the if-clause and the main clause.
For example, If you heat water, it boils.
Use the Zero Conditional for facts that are generally or universally true.
For example, If you heat ice, it melts and If plants do not get water, they die.
The Zero Conditional is commonly used to describe scientific facts and cause-and-effect relationships.
For example, If metal gets hot, it expands.
The Zero Conditional can describe rules, procedures, and instructions that apply whenever a condition occurs.
For example, If the light is red, you stop.
The Zero Conditional can describe habits or repeated results that occur whenever a particular situation happens.
For example, If I drink coffee late, I cannot sleep.
The Present Simple is the most common tense in both clauses of a Zero Conditional sentence.
For example, If people eat too much, they gain weight.
When can sometimes replace if when the condition is expected to happen repeatedly or whenever the situation occurs.
For example, When I drink coffee late, I cannot sleep.
Unless can introduce a condition equivalent to if...not in appropriate contexts.
For example, Plants die unless they get enough water.
An imperative can occur in the main clause when the conditional expresses a general instruction or procedure.
For example, If the screen freezes, restart the computer.
Modal verbs can occur in the main clause when the result expresses ability, permission, obligation, or possibility.
For example, If you finish early, you can leave.
Zero Conditional meanings can be expressed in questions when asking about general consequences or rules.
For example, What happens if you mix these chemicals?
Negative forms can occur in either clause to describe conditions or results that do not normally occur.
For example, If you do not water the plants, they do not grow properly.
The if-clause can come before the main clause and is normally followed by a comma.
For example, If you heat water, it boils.
The main clause can come before the if-clause, usually without a comma.
For example, Water boils if you heat it.
The Zero Conditional normally describes a recurring or general relationship rather than one particular future event.
Compare If you heat ice, it melts with If you heat the ice tomorrow, it will melt, which refers to a particular future situation.
Use the Zero Conditional for general or repeated results and the First Conditional for a particular real or likely future possibility.
Compare If you do not water plants, they die with If you do not water this plant, it will die.
The Zero Conditional describes real general relationships, while the Second Conditional describes hypothetical or unlikely situations.
Compare If I drink coffee late, I cannot sleep with If I drank coffee now, I would not sleep tonight.
The Zero Conditional can describe predictable personal reactions or habits.
For example, If I do not sleep enough, I feel tired the next day.
The Zero Conditional is useful for describing steps and outcomes in technical and practical procedures.
For example, If the temperature rises above 100 degrees, the system shuts down automatically.
The Zero Conditional can describe general principles, processes, and consistently observed relationships in formal and academic writing.
For example, If demand increases, prices tend to rise.
The main clause does not always need to contain a simple present statement; imperatives and modal expressions can be used when the meaning requires them.
For example, If the alarm sounds, leave the building immediately and If you feel unwell, you should contact a doctor.
Words such as always and whenever can reinforce the idea of repeated or general conditional relationships.
For example, Whenever I drink coffee late, I have trouble sleeping.
Use the Zero Conditional for general or repeated relationships and form the clauses correctly.
Common mistakes include using will unnecessarily in both clauses, confusing general truth with a specific future event, and using would when no hypothetical meaning is intended.