This document discusses the zero conditional, which refers to general truths about situations that are always true. It notes that the order of the propositions in a zero conditional sentence can be reversed without changing the meaning. Examples are provided of zero conditional sentences using "if", which can be replaced with "when" without affecting the meaning as both terms express general facts.

1. 

 This conditional refers to a situation that is always
true ( universal truths )
Zero Condicional

2. 
As with all conditional sentences , the order of the
propositions is not fixed. It may be necessary to change
the pronouns and punctuation by reversing the order of
the proposals but the meaning of the sentence will not
change. In the prayers of "conditional zero " you can
replace "if " to " when" without affecting the meaning ,
since both terms are used to express general facts .
Zero Condicional

3. Examples
 If you freeze water, it turns into ice.
Si congelas el agua, se convierte en hielo.
 If I work too much, I get tired.
Si trabajo demasiado, me canso.
 If I have time, I usually go to the movies.
Si tengo tiempo, generalmente voy al cine.
 If she eats hamburgers, she gets an allergy.
Si ella come hamburguesas, le da alergia.
 If they come here, they always bring a present.
Si ellos vienen aquí, siempre traen un regalo.
 If she doesn't know the answer, she keeps silent.
Si ella no sabe la respuesta, se mantiene en silencio.
 If we don't go out on Saturdays, we rent a video and stay home.
Si no salimos los sábados, alquilamos un video y nos quedamos en casa.
Zero Condicional