I buy, I do buy
Tom quiere que Mary compre un nuevo vestido para el banquete.
Tom wants Mary to buy a new dress for the banquet.
Compre dos botellas de aceite cuando vaya al supermercado.
Buy two bottles of oil when you go to the supermarket.
Ya no conozco a nadie que compre CD.
I don't know anyone who buys CDs anymore.
Ella no quiere que él compre un anillo de compromiso caro.
She doesn't want him to buy an expensive engagement ring.