Чтобы преобразовать данные предложения во множественное число, необходимо учитывать несколько правил. Давайте разберем каждое предложение по отдельности.

1. The man is young.

   Преобразуем: The men are young.

2. The little child is in the room.

   Преобразуем: The little children are in the rooms.

3. Where is the book? Is it on the shelf?

   Преобразуем: Where are the books? Are they on the shelves?

4. Is the scarf brown or red?

   Преобразуем: Are the scarves brown or red?

5. Who is the woman? She is my sister.

   Преобразуем: Who are the women? They are my sisters.

6. Is the man a farmer?

   Преобразуем: Are the men farmers?

7. Is the black scarf on the chair?

   Преобразуем: Are the black scarves on the chairs?

8. Is this woman a doctor? No, she is not. She is an engineer.

   Преобразуем: Are these women doctors? No, they are not. They are engineers.

9. The blackboard is on the wall.

   Преобразуем: The blackboards are on the walls.

10. Put the book on the shelf.

    Преобразуем: Put the books on the shelves.

11. The watch is good.

    Преобразуем: The watches are good.

12. The sheep is in the field.

    Преобразуем: The sheep are in the fields.

13. What color is the shirt? It is white.

    Преобразуем: What colors are the shirts? They are white.

Важно помнить, что при образовании множественного числа мы изменяем не только существительные, но и глаголы и местоимения, чтобы они соответствовали множественному числу.