Ok, ehhhh. I'm from México so I speak spanish since I was born.
I think is "Comes"
Now let me explain. The correct question is "¿Tu <u>comes</u> pescado?" or "¿Tu <u>comes</u> pescado?" Is not with "el" because it sounds very forced, I don't know how to explain.
The answer:
¿<u>Comes</u> tu el pescado?
Have a good day ;)
Answer:
le dio las gracias al abuelo por el regalo de cumpleaños
