What does saber mean in the imperfect tense?

Saber means “to know a fact.” In the imperfect, it simply means “used to know” or “knew a fact” because knowledge of a fact was ongoing.

What is saber in subjunctive?

Saber in the Subjunctive Future Perfect

The Subjunctive Future Perfect is used to speak about something that will have happened if a hypothetical situations occurs in the future. For example, “hubiere sabido”, meaning “I will have known”.

What is saber used for?

Saber is used to talk about facts or learned skills. You can use it to talk about information you’ve memorized or to say you are able to swim, draw, speak a language, etc.