1.
(-)Nam didn't go to school yesterday
(?)Did Nam go to school yesterday?
2.
(-)Hoa didn't brush her teeth after meals yesterday
(?)Did Hoa brush her teeth after meals yesterday?
3.
(-)My father didn't do the housework last week
(?)Did my father do the housework last week?
4.
(-)My mother didn't made many cakes this morning
(?)Did my mother made many cakes this morning?
5.
(-)She didn't have a beautiful doll three years ago
(?)Did she have a beautiful doll three years ago?