Im not sure how much this helps, but it looks like you are just looking at the verb deciding if it’s imperfecto or pretérito so here are the conjugations for both.
pretérito:
yo-í
tú-iste
él-ió
nosotros-imos
ellos-ieron
imperfecto:
yo-ía
tú-ias
él-ia
nosotros-iamos
ellos-ian
<em>Complete the following sentences about yourself and your friends and the activities that you like to do. Use the correct form of the verbs in parentheses.</em>
✔1. Usted<u> es </u>de Puerto Rico. (ser)
【<em>Translation 1:</em> You are from Puerto Rico】
✔2. A nosotros nos<u> gusta </u>pasear después de las clases. (gustar)
【<em>Translation 2:</em> We like to walk after classes】
✔3. Me<u> gusta </u>comer las galletas. (gustar)
【<em>Translation 3:</em> I like to eat cookies】
✔4. A Marta no le<u> gusta </u>escribir correos electrónicos (gustar)
【<em>Translation 4:</em> Marta does not like to write emails.】
✔5. Ellos<u> son </u>de Colombia. (ser)
【<em>Translation 5:</em> They are from Colombia.】