Conocer means to get to know so the sentence says Paula is going to know Argentina. I'm guessing Argentina is a person because that doesn't make since
Okay so. Ser has many forms of putting it
Yo-Soy
Tu-Eres
El Ella Ud.-Es
Nosotros-Somos
Vosotros- Sois
Ellos Ellas Uds.-Son
I don't know if i answered right.
Answer:
Antes de estudiar español, yo no podía entender lo que decían mis vecinos cubanos.
The answer is "estan" las sillas en la mesa