¿Cuántas veces a la semana va Josefina a practicar?

Decide whether the sentence is grammatically correct or incorrect as written. esas fresas son de manuel. son sus fresas

Paco tiene que cerrar la computadora open copy close erase

Does anyone know what my spanish teacher means by this? i need to use plural forms of the verb ser. and she asked me to use a couple of adjectives to describe the boys collectively and then the girls collectively?