Answer: The words in caps are the direct object pronoun (YO) meaning (I) and preterite tense (Compre) meaning (Purchased).
Si YO COMPRE los patines (Yes I purchased the skates)
Explanation:
El aerosol solar transparente transforma Windows en vatios.
<span>¡Espero que esto ayude!</span>
It would tienes because it goes with tú. I'm not sure how to really explain it but that's the ser you would use with tú. I hope this helps!