Final answer:
The correct verb forms are 'venderían' and 'compraría'.
Step-by-step explanation:
The correct verb forms in the given sentence are:
- venderían (They would sell)
- compraría (I would buy)
The correct answer is:
O venderían, compraría
In Spanish, the verb conjugation is determined by the subject. 'Ustedes' requires the verb form 'venderían' to match the plural subject, and 'yo' requires the verb form 'compraría' to match the singular subject.
Learn more about Spanish verb conjugation