Здравствуйте! Конечно, давайте сделаем остальные предложения в формате, как в первом примере, используя Present Continuous для утверждений и отрицаний, а также добавим второе предложение с альтернативным действием. Вот что у нас получится:
- The two boys on the beach are reading.
The two boys on the beach aren't reading. They are building a sandcastle.
- The woman under the umbrella is playing with the sand.
The woman under the umbrella isn't playing with the sand. She is reading a book.
- The baby is reading a newspaper.
The baby isn't reading a newspaper. It's playing with a toy.
- The man under the umbrella is drinking some juice.
The man under the umbrella isn't drinking some juice. He is talking on the phone.
- The two girls are fishing.
The two girls aren't fishing. They are swimming in the sea.
Таким образом, каждое предложение преобразовано в отрицательную форму, а также добавлено альтернативное действие, всё в Present Continuous. Надеюсь, ответ понятен!