would this be tú or ella?
La profesora Martínez (usa, usas) la computadora para la clase de español
4 Answers
Ella, because you're talking about her, not to her.
use the verb 'usa' for the third person singular (ella)
I agree with the Himself and Zhmelissa. I also encourage you to check out the reference section on this site. Here is a link to a page discussing present tense conjugations. I hope this helps.
I think it's ella.