The Zero Conditional
Key Points |
The zero conditional talks about facts, routines, and results that are generally true. Both parts usually use the present tense. Use it when one thing regularly causes another thing to happen. Pattern: If + present simple, present simple. You can also put the result first: Present simple + if + present simple. It is also common for rules and instructions: If + present simple, base verb. Example: If you feel sick, call a doctor. |
▶️ The zero conditional expresses facts or truths
If + subject + present tense verb …, subject + present tense verb …
subject + present tense verb … if subject + present tense verb …
Use this form for scientific facts, habits, and things that always or usually happen.
Ice melts if you heat it.
Plants die if they don't get enough water.
If you mix blue and yellow, you get green.
If people eat too much sugar, they gain weight.
▶️ The zero conditional expresses instructions (imperative sentences)
If + subject + verb in present tense …, infinitive verb …
Infinitive verb … if + subject + verb in present tense …
In this use, the if-clause gives the situation, and the main clause tells someone what to do.
If you feel sick, call a doctor.
Don't stay up late if you are tired.
Let me know if you need help.
If the light turns red, stop the car.
▶️ Easy tip
Ask yourself: Is this always true, usually true, or a rule? If yes, the zero conditional is usually the right choice.