Проверьте английский. Исправьте, пожалуйста, если где ошиблась.

Поставьте подлежащее в предложениях во множественное число, произведите все необходимые замены:
1. This man is busy now.
2. The foot is large.
3. That baby is mine.
4. The boat was in the river.
5. A notebook is new.
6. A girl has a new book.

Ответ:
1. These men are busy now.
2. The feet are large.
3. These babies are my.
4. The boats were in the river.
5. A notebooks are new.
6. At girls have a new books.