TOPIC: the washing machine or a washing machine

A girl interviewed a foreginer at the street, she asked him do you know how to use the washing machine?

G:Do you know how to use the washing machine?
~~WHY HAVE "THE", SHE DID NOT WASHING MACHINE BEFORE
F: Of course, I know how to use washing machine.

Actually, in the first sentence, we would use either" a washing machine" or " the washing machine" depending on the context. And in either case, your response for F has a mistake.
For example:
Situation A: You see me standing next to your washing machine, and you say: "Do you know how to use THE washing machine?" (meaning this particiular washing machine)
Reply : Yes , I know how to use IT. ( because we're talking about a specific washing machine_

Situation B: You are wondering if I know how to use this kind of machine in general, so you say:
"Do you know how to use A washing machine?"
Reply: Yes, I know how to use A washing machine/ (becau