Conditional: Present simple for both clauses

* Use the simple present in the if clause with the simple present in the result clause to expresses an established or predictable fact, or it expresses a general truth, expresses a habitual situation or a habitual activity, or gives a command.

Example Sentences

If it gets cold enough, water becomes ice.
If I don't do my homework, I learn nothing.
If Marie doesn't eat dinner, she gets hungry at midnight.
If someone calls, take a message please.

Quiz of the Day - Prepositions of Time: http://esl.about.com/library/beginner/bl_bgtimepreps1.htm

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