"Yo conozco a tu jefe."
Translation:I know your boss.
Hope this helps others. That 'a' was driving me crazy. https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.fluentu.com/blog/spanish/personal-a-in-spanish/&ved=2ahUKEwij8uiIkpPcAhUQq1kKHX5qDLwQFjAAegQIBBAB&usg=AOvVaw1724f02dys_TtlLShWpjSL
Don't worry, most of us don't understand it too, we only use it because... we know that it has to be there.
The personal a is a vestige from older languages on which Spanish is based. Using it shows caring/concern/respect for the human (or pet) it's referencing. And not using it is considered disrespectful.