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Es correcto tu oracion porque "could" es el pasado de "can" ( poder ) pero tambien es usado como perogativo, you could be more smart, Podrias se mas listo, tu misma lo dicen en tu pregunta

How could another examples be ??

como podriian ser otros ejemplos

1- If you study hard, you could increase your qualifications.

2- She could travel to Europe after she obtained the passport.

3- I couldn't answer your question because I didn't know about that matter.

4- If he doesn't hurry, he couldn't come on time.

5- We never couldn't understand those Maths lessons.

6- Could they lend us the dictionary?

7- Could it drink sea water?

8- I couldn't never eat oysters.

9- The police could be more gentle, don't you believe?

10- What could we do to increase our money?

tu oracion se refiere a una accion que no podias hacer en el pasado y ahora si lo puede hacer.

como por ejemplo

I couldn't ride a bike last year, but now I can:

(Yo no podia montar una bici el año pasado, pero ahora si puedo)

IF YOU WOULD INVITE ME, I COULD GO TO YOUR HOUSE