Как составить 7 предложений с глаголом buy покупать

Проверяй, а то мало ли

1)I buy the bag.
2)He bought the ticket to cinema yesterday.
3)Did you buy computer?
4)Don't forget to buy products!
5)Will she buy food for dogs?
6)You have already bought bread, haven't you?
7)I will call you, when I buy this thing.