I don't know what to do with these questions. I have to use the Uds. form

(Comprar) tomates y lechuga.
(hacer) ensalada hoy.
(poner) tanto aceite en la comida.
El vino? No (servirlo) todavía.

To conjugate the verbs in the Uds. form, you need to follow these steps:

1. Identify the infinitive form of the verb.
2. Remove the -ar, -er, or -ir ending to find the stem.
3. Add the appropriate ending for the Uds. form.

Now let's apply these steps to each verb:

1. Comprar: The infinitive form is "comprar."
2. Remove the -ar ending to find the stem, which is "compr-."
3. Add the appropriate ending for the Uds. form, which is "-en."
Result: Compran tomates y lechuga.

1. Hacer: The infinitive form is "hacer."
2. Remove the -er ending to find the stem, which is "hac-."
3. Add the appropriate ending for the Uds. form, which is "-en."
Result: Hacen ensalada hoy.

1. Poner: The infinitive form is "poner."
2. Remove the -er ending to find the stem, which is "pon-."
3. Add the appropriate ending for the Uds. form, which is "-en."
Result: Ponen tanto aceite en la comida.

1. Servir: The infinitive form is "servir."
2. Remove the -ir ending to find the stem, which is "sirv-."
3. Add the appropriate ending for the Uds. form, which is "-en."
Result: Sirven el vino? No lo sirven todavía.

So the Uds. conjugations for the given sentences are:

- Compran tomates y lechuga.
- Hacen ensalada hoy.
- Ponen tanto aceite en la comida.
- Sirven el vino? No lo sirven todavía.