Practice.
Answer first, then read the explanation. Don't skip it — that's the whole point.
De niño yo no _____ montar en bicicleta. (saber)
As a child I didn't know how to ride a bike.
¿Tú ya _____ que Rodrigo y Elena eran novios? (saber)
Did you already know that Rodrigo and Elena were dating?
Cuando era joven, mi abuelo _____ reparar cualquier motor. (saber)
When he was young, my grandfather knew how to repair any engine.
En esa época nosotros no _____ nada de tecnología. (saber)
Back then we didn't know anything about technology.
Todos en el barrio _____ que doña Rosa cocinaba delicioso. (saber)
Everyone in the neighborhood knew that Doña Rosa cooked deliciously.
Cuando vivía en Bogotá, yo _____ llegar a todas partes sin mapa. (saber)
When I lived in Bogotá, I knew how to get everywhere without a map.
Antes tú _____ todas las canciones de Selena de memoria. (saber)
You used to know all of Selena's songs by heart.
La maestra siempre _____ cuándo alguien copiaba en clase. (saber)
The teacher always knew when someone was cheating in class.
Nosotros _____ que el examen iba a ser difícil. (saber)
We knew the exam was going to be hard.
Mis hermanos no _____ nadar hasta los quince años. (saber)
My brothers didn't know how to swim until they were fifteen.
De pequeños, ¿vosotros _____ los nombres de los ríos de España? (saber)
When you were little, did you all know the names of the rivers of Spain?
Yo no _____ que el museo cerraba los lunes. (saber)
I didn't know the museum closed on Mondays.
Nadie _____ la respuesta cuando el profesor preguntó. (saber)
Nobody knew the answer when the teacher asked.
Los turistas no _____ que la catedral estaba cerrada por obras. (saber)
The tourists didn't know the cathedral was closed for renovations.
Not just a green check. A short paragraph telling you why.
No streaks, no points, no leaderboards. Just questions.
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