Ответ:

2)the nurses don't help people.

Do the nurses help people ?

3)a waiter doesn't serves food and drinks.

Does a waiter serves food and drinks?

4)the mechanics don't fix car.

Do the mechanics fix car?

5)a teacher doesn't teach student.

Does a teacher teach a student?

6)the postmen don't carry a big bag.

Do the postmen carry a big bag?