They will have an exam next week.
否定句：They will not have an exam next week.
疑问句：Will they have an exam next week?
回答：Yes, they will. No, they will not.
Lily has Chinese classes every day.
否定句：Lily doesn't have Chinese classes every day.
疑问句：Does Lily have Chinese classes every day?
回答：Yes, she does. No, she doesn't.
Tom and his mother are having lunch at home.
否定句：Tom and his mother are not having lunch at home.
疑问句：Are Tom and his mother having lunch at home?
回答：Yes, they are. No, they are not.