
ZERO CONDITONAL = TRUE FACT
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The construction is:
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IF + verb (simple preset conjugation) = verb (simple present conjugation)
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If it doesn't rain, plants don't grow.
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Water boils if you heat it to 100 degrees.
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Turn the lights off if you want the room to get dark.
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If I drink coffee, I get a headache.
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OBS: The conjunction IF can often be substituted by the words WHEN or UNLESS.
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Take a look at the links below:
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http://web2.uvcs.uvic.ca/elc/StudyZone/330/grammar/0cond1.htm
http://www.englishgrammarsecrets.com/type0/exercise1.html
http://www.englishgrammarsecrets.com/type0/exercise2.html
http://www.stclaresenglish.net/langprac/con0ex1.htm
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Best wishes,
André










