Read the sentences and choose the verb with the right form in Present Simple negative. Vets
treat people because they are animal doctors.
A flight attendant
let passengers walk around the plane while landing.
Teachers
work night shifts because school starts in the morning and finishes in the afternoon.
Vets don't treat people because they are animal doctors.
A flight attendant doesn't let passengers walk around the plane while landing.
Teachers don't work night shifts because school starts in the morning and finishes in the afternoon.