Преобразуте следующие предложения в форму множественного числа This pencil is in the box. Is this a good disco? This

1. This pencil is in the box. These pencils are in the box.

2. Is this a good disco? Are these good discos?

3. This boy isn\'t my son. These boys aren\'t my sons.

4. Is your sister an experienced doctor? Are your sisters experienced doctors?

5. This key is on the shelf. These keys are on the shelf.