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English Grammar Reference: The Zero Conditional

We use the Zero Conditional to talk about something which happens in general. If, or when, something happens something else always happens. It can be used to talk about routines and facts.

If I can't sleep, I read my book.
If you heat water, it becomes steam.

Look at the construction:

If

subject

present simple

subject

present simple

If

I

have a headache

I

take an aspirin

If
it
doesn't rain for a while
there
is a shortage of water.
If
she
tries her best
she
always succeeds.

Look at the question form:

Question word

Auxiliary

Subject

Verb

if + subject + present

What

do

you

do

if you are bored?

 

Does

snow

melt
if you take it inside?

 

Does

your mother

celebrate

if you score a goal?

 

See also:

English Grammar Reference
First conditional, Second conditional, Third conditional, Mixed conditionals