{What_time_does_Zoe_go_to_bed?;When_do_Zoe_go_to_bed?;Which_time_does_Zoe_go_to_bed?}
Zoe goes to bed at 9.30 every evening.
{Why_is_he_preparing_so_much_food?;Why_does_he_prepare_so_much_food?;What_is_he_preparing?}
He's preparing so much food because some friends are coming for lunch.
{Why_aren't_you_studying?;Why_are_you_studying?;Why_don't_you_study?}
I'm not studying because we postponed the test.
The Smiths are staying with their relatives for Christmas holidays.