Zero conditional
If + present simple, present simple — facts and rules, using Unit 31 words.
The zero conditional describes things that are always true: facts, rules, and automatic results. Both clauses use the present simple. Every example uses this unit's facts-and-rules vocabulary.
A — How it works
Form: If/When + present simple, present simple. 'If' and 'when' are both possible for general truths. Use 'unless' for 'if not'.
1) Facts & general truths
If + present, present.
- If you heat ice, it melts.
- If you eat a balanced diet, you feel better.
- When water reaches 100°C, it boils.
- If the manager approves, the process starts automatically.
2) Rules with as long as / unless
Conditions and results.
- If customers don't have a receipt, the shop doesn't give a refund.
- You get a refund as long as you have proof of purchase.
- Unless you check the rules, you make mistakes.
- If staff follow the rules, the kitchen stays safe.
The rest of this lesson is in the General English course:
- B — Quick reference
- Remember
Try it: Choose the correct form
Select the best option.
- If you ___ ice, it melts.
(a) heat (b) will heat (c) heated - If you eat well, you ___ better.
(a) feel (b) will feel (c) felt - You get a refund ___ ___ ___ you have a receipt.
(a) as long as (b) unless (c) provided - ___ you check the rules, you make mistakes. (if not)
(a) Unless (b) As long as (c) When - Zero conditional uses ___ in both clauses.
(a) present simple (b) will (c) past - When water reaches 100°C, it ___.
(a) boils (b) will boil (c) boiled
Check your answers in the course — it marks them instantly. This is one of the unit's 3 exercises; the other 2 are in the General English course too.
Practise this unit in the course →