0 conditional

If clause	Main clause
If + Present tense	Present tense
If you freeze water	it turns into ice.

• 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.

IF	condition	result
	present simple	present simple
If	I miss the 8 o'clock bus	I am late for work.
If	I am late for work	my boss gets angry.
If	people don't eat	they get hungry.
If	you heat ice	does it melt?