Давайте заменим выделенные слова личными местоимениями в именительном или объектном падеже. Я объясню, как это сделать, шаг за шагом.

1. The vase is on the table. - Заменяем "the vase" на "it": It is on the table.
2. Mother often sends Ben to buy milk. - Заменяем "Ben" на "him": Mother often sends him to buy milk.
3. Are Bess and Helen ready to do the work? - Заменяем "Bess and Helen" на "they": Are they ready to do the work?
4. Nick and Ben spend their holidays at the seaside. - Заменяем "Nick and Ben" на "they": They spend their holidays at the seaside.
5. The man is in the park. - Заменяем "the man" на "he": He is in the park.
6. The managers are not at work now. - Заменяем "the managers" на "they": They are not at work now.
7. Helen and I are good friends. - Заменяем "Helen and I" на "we": We are good friends.
8. Is Ben at the lesson now? - Заменяем "Ben" на "he": Is he at the lesson now?
9. Where is the calculator? - Заменяем "the calculator" на "it": Where is it?
10. The newspapers are on the table. - Заменяем "the newspapers" на "they": They are on the table.
11. The child is in the garden with his mother. - Заменяем "the child" на "he" или "she" (в зависимости от пола): He/She is in the garden with his/her mother.
12. Our parents are always glad to see us. - "Our parents" заменяем на "they": They are always glad to see us.
13. My brother and I are good football players. - Заменяем "my brother and I" на "we": We are good football players.
14. Bess knows Ben. - Заменяем "Ben" на "him": Bess knows him.
15. I see the picture very well. - Заменяем "the picture" на "it": I see it very well.
16. The students have lectures every day. - Заменяем "the students" на "they": They have lectures every day.
17. The boy plays football every Sunday. - Заменяем "the boy" на "he": He plays football every Sunday.
18. The teacher asks the students. - Заменяем "the students" на "them": The teacher asks them.
19. The students write tests every week. - Заменяем "the students" на "they": They write tests every week.
20. Look at the picture! - Заменяем "the picture" на "it": Look at it!
21. I have the book at home. - Заменяем "the book" на "it": I have it at home.
22. Max wants to speak to Helen. - Заменяем "Helen" на "her": Max wants to speak to her.

Таким образом, мы заменили выделенные слова на соответствующие личные местоимения. Если у вас есть вопросы или нужно больше объяснений, не стесняйтесь спрашивать!