Determine si las siguientes frases está utilizando el verbo ir o ser. Usa el contexto para ayudarte.
Yo fui a la manifestación en la Plaza Bolívar.
Mis padres fueron a La Habana de vacaciones.
Tú fuiste un buen amigo en la escuela.
Vosotros fuisteis a la graduación de Paco.
Marisela y yo fuimos novios el año pasado.

1. Yo fui a la manifestación en la Plaza Bolívar. (ir)

2. Mis padres fueron a La Habana de vacaciones. (ir)

3. Tú fuiste un buen amigo en la escuela. (ser)

4. Vosotros fuisteis a la graduación de Paco. (ir)

5. Marisela y yo fuimos novios el año pasado. (ser)

Explanation:

Basics: Ir is to go. Ser is to be.

1. I went to the demonstration at the Bolívar Plaza. In this sentence, subject "I" is going somewhere, making the verb for the sentence ir.

2. My parents went to the Habana for vacation. In this sentence, subject "parents" are going somewhere, making the verb for the sentence ir.

3. You were a good friend at school. In this sentence, subject "You" was a good friend, making the verb ser.

4. You went to the graduation of Paco. In this sentence, subject "you" is going somewhere, making the verb for the sentence ir.

5. Marisela and I were dating/boyfriend and girlfriend last year. In this sentence, subject "Marisela and I" were something, making the verb ser.

corras is the only one that is informal but doesn't follow the suffix rule. correr is the verb. corre is the formal verb form. corra would be used as the formal is corre ended with an a.

your best bet would be corras, it's the only one that is informal but is still wrong