Zero Conditional
Zero Conditional
When we want to talk about things that are always or generally true, we can use
If/When/Unless plus a present form PLUS present simple or imperative.
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If you press this button, you get black coffee.
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When you fly budget airline, you don’t expect to get anything to eat.
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Unless you need a lot of leg-room, don’t pay the extra for first class.
Notice that we are talking about something which is generally true, not a specific event.
In the condition clause, there can be a variety of present forms. In the result clause, there can only be the present simple or imperative.
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If you visit Barcelona, look out for the spectacular architecture.
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If unemployment is rising, people tend to stay in their present jobs.
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If you’ve finished everything, go home.
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When you go to Barbados, take plenty of sun cream.
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When I’m working, please be quiet.
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When I’ve written a new article, I run it through my spell-checker.
Notice that ‘unless’ means the same as ‘if not’.
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Unless he asks you to continue, stop all work on the project.
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Unless interest rates are rising, it’s not a good investment.
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Unless you’ve been to Tokyo yourself, you don’t really understand how fantastic it is.
HAVE A NICE DAY
For further details
click on pages of other uses of conditinal
on the right hand column.
https://learningenglishgrammar.wordpress.com/tenses/conditionals-%e2%80%93-simple-past-and-past-perfect-tenses/
Uncle Teng
Learning English by Uncle Teng 
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