1. (+) John likes tea

(-) John don't likes tea

(?) do John like tea?

2. (?) does he sell good cakes‽

(+) He does sell good cakes

(?) he doesn't sell good cakes

3. (-) you don't speak softly

(+) you do speak softly

(?) do you speak softly?

4. (+) it tastes good

(-) it don't tastes good

(?) do it tastes good?

5. (+) I read well

(-) i don't read well

(?) do i read well?

6. (+) he is taking his car to his office

(-) he don't taking his car to his office

(?) do he taking his car his office?

7. (+) are they playing football

(-) are they don't playing football

(?) do are they playing football?

8. (+) it costs five cent

(-) it costs don't five cent

(?) do it costs five cent?

9. (-) she doesn't swim will

(+) she does swim will

(?) does she swim will?

10. (+) they try to understand

(-) they don't try to understand

(?) do they try to understand?