1.My father waters this flower every morning.
(-) My father doesn't this flower every morning.
(?) Does your father water this flower every morning?
2.john invilt fiona to his birthday party last night.
(-) John didn't invilt fiona to his birthday party last night.
(?) Did John invilt fiona to his birthday party last night?
3.her mother is preparing the dinner in the kitchen.
(-) Her mother isn't preparing the dinner in the kitchen.
(?) Is her mother preparing the dinner in the kitchen?
4.we should clean our teeth twice a day.
(-) We shouldn't clean our teeth twice a day.
(?) Should we clean our teeth twice a day?
5.teacher have explained the English grammar
(-) Teacher have not explained the English grammar.
(?) Have teacher explained the English grammar?