What is the rule? what other verb is used.
The imperfect subjunctive is used to talk about hypotheticals preceded by Sí (if)
Other verb used is the conditional
What is the structure?
Sí clause + imperfect subjunctive + conditional
What does the imperfect subjunctive relate to?
What does the conditional?
IS: improbable situation related to the subject: IF I had/ was X
Cond: what WOULD be done if unlikely condition were present.
If I were rich, I would travel all over the world
Sí fuera rico, viajaría todo el mundo
If I lived in another country, I would learn the language
Sí viviera en el otro pais, aprendería la idioma