1. Liz bought many souvenirs in Ho Chi Minh City
=> Liz didn't buy any souvenirs in Ho Chi Minh City
=> Did Liz buy any souvenirs in Ho Chi Minh City?
2. I was very tired after the trip
=> I wasn't very tired after the trip
=> Was you very tired after the trip?
3. They are watching a cartoon film
=> They aren't watching a cartoon film.
=> Are they watching a cartoon film?
4. We have visited Cham Temples before
=> We haven't visited Cham Temples before.
=> Have you visited Cham Temples before?
5. Trung's brother goes on holiday in Ha Long Bay every summer
=> Trung's brother doesn't go on holiday in Ha Long Bay every summer.
=> Does Trung's brother go on holiday in Ha Long Bay every summer?
6. They will take their son to the zoo next weekend.
=> They won't take their son to the zoo next weekend.
=> Will they take their son to the zoo next weekend?
