Did I translate these sentences right?

Question

Here are the sentences:

We had finished three exercises from this chapter. Habíamos terminado tres ejercicios de este capítulo.

We had called my sister before going to the market. Nosotros habíamos llamado mi hermana por teléfono antes de ir al mercado.

We had opened the windows in your room. Nosotros habíamos abierto las ventanas en tu cuaderno.

I hope they are correct, but is anyone able to check them?

"llamado a mi hermana" You need the "a" :) - bosquederoble, Apr 9, 2017

That's exactly what I thought upon reading ali these sentences :) - FELIZ77, Apr 9, 2017

en tu cuarto :) - FELIZ77, Apr 9, 2017

I missed that one. Thanks Feliz and jtaniel. :) - bosquederoble, Apr 9, 2017

Thanks, guys! - CarterTF, Apr 9, 2017

You are very welcome, :) - FELIZ77, Apr 9, 2017

Answer 1

Habíamos terminado tres ejercicios de este capítulo.
Yes.

Nosotros habíamos llamado mi hermana por teléfono antes de ir al mercado.
Nosotros and por teléfono are unnecessary.
You need the personal a. (Thanks, bosquederoble.)

Nosotros habíamos abierto las ventanas en tu cuaderno.
Nosotros is unnecessary. A cuaderno is a notebook.

Right, thanks! I was thinkin galong the lines of cuarto, haha. - CarterTF, Apr 9, 2017

Haha, I mean "...I was thinking along..." - CarterTF, Apr 9, 2017