Lets say if the sentence was

“ Pablo _____ la basura” (sacar)

If I conjugate the verb sacar, to me it sounds like a El/Ella/Usted so I thought it would be Saca.

But its Pablo so i thought it would be a Yo(I) thing so i also thought it could be saco.

Basically i have trouble questioning of how to conjugate a verb if it has a name instead of a Yo, Tu. How should I conjugate it?