“Si hubiera sabido…”: the past that did not happen
CEFR C1
“Por más que lo intente”, “a fin de que sepas”The conjunctions that always take the subjunctive —“para que”, “a fin de que”, “sin…What you can say to whomTelling apart what belongs in a message to a friend, in an email to a stranger and in a…“Por” and “para”, the hard halfThe pairs where both are possible and the meaning changes: “estar por” against “estar…“Ponerse”, “volverse”, “hacerse”, “quedarse”: four “become”Choosing among the four: “ponerse” for a passing state, “volverse” for a lasting change…What people write and what people sayWhat changes between the two: the “ser” passive, “cuyo”, the tenses that survive only in…“Me alegro DE que” but “pienso QUE”Deciding whether a verb or an expression needs “de” in front of “que”: “me acuerdo de…The rule, in three lines
For a past that did not happen: si hubiera sabido, habría venido. It is built with hubiera —or hubiese, they are interchangeable— plus the participle. And Spanish accepts hubiera in BOTH halves: si hubiera sabido, hubiera venido is completely standard.
The usual slip. Using the imperfect subjunctive for a past condition: si supiera ayer, which mixes two different times.
Why it catches you out. English has the same three-step structure —“if I HAD KNOWN, I WOULD HAVE COME”— so the logic transfers whole and you already know when to use it. What does not transfer is that both halves can take the same form in Spanish, which sounds wrong to you and is what most people actually say.