Zero conditional
When we talk about things that are generally or always true, we can use:
If/When/Unless plus a present form PLUS present simple or imperative
• If he gets there before me, ask him to wait.
• When you fly budget airline, you have to pay for your drinks and snacks.
• Unless you need more space, a small car is big enough for one person.
Note that we are not talking about a specific event but something which is generally
true.
In the condition clause, we can use a variety of present forms. In the result clause, there
can only be the present simple or imperative.
• If you visit London, go on the London Eye.
• If unemployment is rising, people tend to stay in their present jobs.
• If you've done that, go and have a coffee.
• When you go on holiday, take plenty of sun cream. It'll be very hot.
• When I'm concentrating, please don't make so much noise.
• When I've finished an article, I always ask Kate to read it through.
Notice that 'unless' means the same as 'if not'.
• Unless he asks you politely, refuse to do any more work on the project.
• Unless prices are rising, it's not a good investment.
• Unless you've been there yourself, you don't really understand how fantastic it is.
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