1,The girl often listens to pop music 

(-) The girl doesn't often listen to pop music 

(?) Does the girl often listen to pop music? 

2,I am from the capital of Viet Nam ,Ha Noi 

(-) I am not from the capital of Viet Nam ,Ha Noi 

(?)Are you from the capital of Viet Nam ,Ha Noi ?

3,My father doesn't keep the greenhouse warm at night 

(+) My father keeps the greenhouse warm at night 
(?)Does my father keep the greenhouse at night? 

4,Does Danny remember to phone his father on Sundays? 

(+)Danny remembers to phone his father on Sundays 

(-)Danny doesn't remember to phone his father on Sundays 

5,They don't do their homework after school 

(+)They do their homework after school 

(?)Do they do their homework after school?