ZERO CONDITIONAL

In the conditional sentences of type 0 ("zero conditional"), the verb tense in both propositions is the "simple present".

PROPOSITION "IF" (CONDITION)                        MAIN PROPOSITION (RESULT)

"if" + "simple present"                                                "simple present"
If this thisgs happens That thing happens

As with all conditional sentences, the order of propositions is not fixed. It may be necessary to modify pronouns and punctuation by reversing the order of the propositions but the meaning of the sentence will not change. In "zero conditional" sentences, "if" can be replaced by "when" without affecting the meaning, since both terms serve to express general facts.

If you eat ice cream, it melts

Ice melts, if yoy eat it