Nosotros somos de Guatemala.
Because ser is for more permanent things, like character traits or nationalities, while estar is more for temporary things like feelings or current location
How to remeber ser and estar easy
for how you feel or where you are, always use the verb estar
Answer:
5. Nosotros usamos el libro de texto
6. Ella repasa mucho para el examen
7. Tu hablas con tus amigos en clase
