You have to take my body to the morgue.
I can't because your alive
You have to take my cat to her checkup
I can't because the sky is falling
You have to cook me food
I can't because my fish ate my arms.
You have to find me new arms and afix them back on.
Alas, I cannot... as I also have no arms. Or legs. Or torso.
You must assemble me a robot to serve as my functional arms.
I do know how to build you a robot and I have good vision, but I am deaf and don't know how to read.
You have to teach me how to read somehow and then I can build your robot.