Zero Conditional: certainty

We use the so-called zero conditional when the result of the condition is always true, like a scientific fact.

Take some ice. Put it in a saucepan. Heat the saucepan. What happens? The ice melts (it becomes water). You would be surprised if it did not.

IF	condition	result
	present simple	present simple
If	you heat ice	it melts.

Notice that we are thinking about a result that is always true for this condition. The result of the condition is an absolute certainty. We are not thinking about the future or the past, or even the present. We are thinking about a simple fact. We use the present simple tense to talk about the condition. We also use the present simple tense to talk about the result. The important thing about the zero conditional is that the condition always has the same result.

We can also use when instead of if, for example: When I get up late I miss my bus.

Look at some more examples in the tables below:

IF	condition	result
	present simple	present simple
If	I miss the 8 o'clock bus	I am late for work.
If	I am late for work	my boss gets angry.
If	people don't eat	they get hungry.
If	you heat ice	does it melt?

result	IF	condition
present simple		present simple
I am late for work	if	I miss the 8 o'clock bus.
My boss gets angry	if	I am late for work.
People get hungry	if	they don't eat.
Does ice melt	if	you heat it?