Practice.
Answer first, then read the explanation. Don't skip it — that's the whole point.
Cuando era niño, _____ pasar horas leyendo sin cansarme. (poder)
When I was a kid, I could spend hours reading without getting tired.
Antes tú _____ correr diez kilómetros sin problema, ¿verdad? (poder)
You used to be able to run ten kilometers without a problem, right?
De joven, mi abuela _____ coser vestidos enteros en un día. (poder)
As a young woman, my grandmother could sew entire dresses in a day.
En aquella casa nosotros _____ ver las montañas desde la cocina. (poder)
In that house we could see the mountains from the kitchen.
Antes los vecinos _____ dejar las puertas abiertas sin miedo. (poder)
People in the neighborhood used to be able to leave their doors open without fear.
Yo no _____ dormir bien cuando vivía cerca del aeropuerto. (poder)
I couldn't sleep well when I lived near the airport.
Cuando eras estudiante, _____ comer pizza todos los días. (poder)
When you were a student, you could eat pizza every day.
El perro ya no _____ caminar mucho porque estaba viejo. (poder)
The dog could no longer walk much because he was old.
De niños, mi hermano y yo _____ quedarnos despiertos hasta tarde. (poder)
As kids, my brother and I were allowed to stay up late.
En esa época, las mujeres no _____ votar en muchos países. (poder)
Back then, women couldn't vote in many countries.
Mientras yo trabajaba allí, _____ usar el gimnasio gratis. (poder)
While I worked there, I could use the gym for free.
¿Es cierto que de niño tú _____ hablar japonés? (poder)
Is it true that as a child you could speak Japanese?
Laura _____ tocar el piano de oído cuando era pequeña. (poder)
Laura could play the piano by ear when she was little.
Antes, mis tíos _____ arreglar cualquier aparato sin manual. (poder)
My uncles used to be able to fix any appliance without a manual.
Not just a green check. A short paragraph telling you why.
No streaks, no points, no leaderboards. Just questions.
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