están memorizando
-they/you are memorizing
Present progressiveellos/ellas/ustedesconjugation ofmemorizar.

memorizar

A propósito, si se la están memorizando y hay dos personas en tu fiesta, porque no cada uno de ustedes memoriza una frase.
And by the way, if you're memorizing and there are two people in your party, why not each one of you memorize every other word.
Word of the Day
to snore