<u>Answers:</u>
In spanish (castillian) gramar the Preterite Tense ( Simple Past) is used to express specific actions completed or concluded in the past that are separated from the present.
In other words:
It is applied when the person speaking gives information about the past that is not related to the present.
In addition, it is important to note that in Spanish the verbs must be conjugated according the subject or the noun in the sentence and must match in number and genre with the noun.
For example, the verb ir (to go) is conjugated in preterite, according to the personal pronouns as:
1st person singular: Yo fui
2nd person singular (informal): Tú fuiste
2nd person singular (formal): Usted fue
3rd person singular: El/eso, Ella/esa fue
1st person plural: Nosotros fuimos
2nd person plural: Ustedes(In latinAmerica) fueron
2nd person plural: Vosotros(In Spain) fuisteis
3rd person plural: Ellos/Ellas fueron
Taking this into account, let’s begin with the answers:
<h2>1. Right answer: fue
</h2>
In this sentence the subject tu Hermana (your sister) corresponds to the <u>third person in singular feminine</u> ella (she). Therefore, according the conjugation list above, the right verbal tense is <u>fue</u>.
¿Adonde <u>fue</u> tu hermana?
Where did your sister go?
<h2>2. Right answer: fueron
</h2>
In this sentence the subject Mariana y Esteban corresponds to the <u>third person in plural</u> ellos (they). Therefore, according the conjugation list above, the right verbal tense is <u>fueron</u>.
Mariana y Esteban <u>fueron</u> al zoológico, ¿no?
Mariana and Esteban went to the zoo, right?
<h2>3. Right answer: fuimos
</h2>
In this sentence the subject Mi hermano y yo (My brother and I) corresponds to the <u>first person in plural</u> nosotros (we). Therefore, according the conjugation list above, the right verbal tense is <u>fuimos</u>.
Mi hermano y yo <u>fuimos</u> al supermercado
My brother and I went to the supermarket
<h2>
4. Right answer: fui
</h2>
In this sentence the subject yo (I) corresponds to the <u>first person in singular</u>. Therefore, according the conjugation list above, the right verbal tense is <u>fui</u>.
Yo <u>fui</u> a la casa de mi amiga
I went to my friend’s house
<h2>5. Right answer: fueron
</h2>
In this sentence the subject Elena y Juanita corresponds to the <u>third person in plural feminine</u> ellas (they). Therefore, according the conjugation list above, the right verbal tense is <u>fueron</u>.
Elena y Juanita <u>fueron </u>al cine
Elena and Juanita went to the movie theater
<h2>6. Right answer: Lavaste
</h2>
In this sentence the subject tú (you) corresponds to the <u>second person in singular</u>. Therefore, according the conjugation in preterite the verb lavar (to wash) is lavaste (you washed).
Ayer tú <u>lavaste</u> la aspiradora
Yesterday you washed the vacuum cleaner
The options planchamos (we ironed), pasaste (you passed), barrí (I swept) <u>are incorrect</u> because they do not correspond with the context of the sentence.
<h2>7. Right answer: False
</h2>
Generally the dishes are washed in the sink (fregadero), not in the washing machine.
The correct form to write the sentence is:
Lavo los platos en el <u>fregadero
</u>
I wash the dishes in the sink
<h2>8. Right answer: False
</h2>
The sentence Tú fuiste a la discoteca mañana (You went to the disco tomorrow), is incoherent, because the conjugation of the verb ir (to go) in <u>preterite</u> or past <u>does not correspond</u> with the <u>time adverb</u> mañana (tomorrow).
The correct sentence must be:
Tú fuiste a la discoteca <u>ayer</u>
You went to the disco yesterday
2. Jorge irá a visitar monumentos en el centro 
4. Nosotros vamos vamos a nadar en el gimnasio