¿(subir) ustedes las bebidas? y tú, andrés, ¿ (poner) la comida en el refrigerador? y tú, brenda, ¿ (tener) tiempo de buscar los discos compactos? los dos, ¿les (dar) los mapas a sus invitados? andrés, ¿ (buscar) el pedido del supermercado? ustedes, ¿ (empezar) a limpiar la casa?

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¿(subir) ustedes las bebidas? y tú, andrés, ¿ (poner) la comida en el refrigerador? y tú, brenda, ¿ (tener) tiempo de buscar los discos compactos? los dos, ¿les (dar) los mapas a sus invitados? andrés, ¿ (buscar) el pedido del supermercado? ustedes, ¿ (empezar) a limpiar la casa?

THIS IS THE BEST ANSWER 👇

I found the whole exercise on the Internet and saw that you need to use the antecedent form of these verbs in parentheses. So here are the answers and explanations:
1. Subieron ustedes las bebidas?
The sub-verb of the verb is a regular verb, which means that there is a certain rule that you use when you harmonize it. For preterite, all you have to do is delete the -ir end of the verb, and add the following suffixes: (singular) 1. í; 2. iste; 3. yes; (plural) 1. imos; 2. isteis; 3. ieron. As you can see here, sub + ieron is subieron.

2. Y tu, Andres, pusiste la comida en el refrigerador?
When it comes to the verb poner (bring), it is irregular, which means that you have to learn the whole harmonization of this verb from the heart. Here’s how it goes: puse, pusiste, puso, pusimos, pusisteis, pusieron. You need a second person who is a puss.

3. Y tu, Brenda, tuviste tiempo de buscar los discos compactos?
When it comes to the verb tener (have), it is also irregular, which means that you have to learn the whole harmonization of this verb from the heart. Here’s how it goes: tuve, tuviste, tuvo, tuvimos, tuvisteis, tuvieron. You need a second person who is tuviste.

4. Los dos, les dieron los mapas a sus invitados?
When it comes to the verb dar (give), it is also irregular, which means that you have to learn the full harmony of this verb by heart. Here’s how it goes: di, diste, dio, dimos, disteis, dieron. You need the third person plural who is dieron.

5. Andres, buscaste el pedido del supermercado?
The verb (search) verb buscar is regular (except the first singular in a prepositional form, i.e. busqué, but you do not need that form here), which means that you can delete -ar from the infinitive, and add with – aste for the second singular, who gives us a buscaste.

6. Usted empezaron a limpiar la casa?
The verb empezar (beginning) is also a regular verb (except the first singular in an antecedent form, that is empecé, but you do not need that form here), which means that you can delete -ar from the infinitive , and add -aron for the third person plural, which gives us empezaron.