1) They had many mistakes in the test.
Общий: Did they have many mistakes in the test?
Альтернативный: Did they have many mistakes in the test or in the essay?
2) You had an interesting trip.
Общий: Did you have an interesting trip?
Альтернативный: Did you or your brother have an interesting trip?
3) He had a lot of money.
Общий: Did he have a lot of money?
Альтернативный: Did he have or lose a lot of money?
4) We had a problem.
Общий: Did we have a problem?
Альтернативный: Did we or you have a problem?
5) My friend had a new computer.
Общий: Did my friend have a new computer?
Альтернативный: Did my friend have a new or old computer?
6) Children had many toys.
Общий: Did they have many toys?
Альтернативный: Did they have many or few toys?