Question

Uds. (usar)___________

Answer 1

@grrrxxiii

Answer 2

Hello!
Here are the endings you'll need to choose from:

(yo) -o
(tu) -as
(el/ ella/ Ud.) -a
(nosotros/ nosotras) -amos
(vosotros/ vosotras) -ais
(ellos/ ellas/ Uds.) -an

Hope this helps!
Blessings

P.S.: By the way... Also, remember you need to take -AR out of USAR before adding the right ending.