To be
Does he lives in this street?
Does he live in this street?
My best friend don't know the answer.
My best friend doesn't know the answer.
The company produce different products.
WRONG The company produces different products.
Are they eat a lot of fast food?
Do they eat a lot of fast food?
Does your mother work in a bank?
Right
The teacher speak very fast.
The teacher speaks very fast.
Carlos and Fred not like tennis.
Carlos and Fred don't like tennis.