`1.` PĐ: Hoa doesn't go on holiday every winter
NV: Does Hoa go on holiday every winter?
`2.` PĐ: The water isn't hot in summer
NV: Is the water hot in summer?
`3.` PĐ: They aren't listening to music at the moment
NV: Are they listening to music at the moment?
`4.` PĐ: Ba doesn't often wash his teeth every day
NV: Does Ba often wash his teeth every day?
`5.` PĐ: My sister doesn't have lunch at this time
NV: Does my sister have at this time?
`6.` PĐ: We play outside in the evening
NV: Do we never play outside in the evening?
`7.` My dad doesn't sometimes read books in the evening
NV: Does my dad sometimes read books in the evening?
`8.` PĐ: Mr. Nam isn't driving at present
NV: Is Mr. Nam driving at the present?
`9.` PĐ: The trees often aren't green in the spring
NV: Are the trees often green in the spring?
`10.` PĐ: Lan and Hoa aren't usually early at school
NV: Are Lan and Hoa usually early at school?
`**` PĐ là phủ định
NV là nghi vấn