Ответ:
1. this is an interesting book. take the book from my table.
2. the sun is shining brightly today.
3. this is a girl. the girl is wearing a beautiful dress.
4. hes got a ball. the ball is big.
Объяснение:
a - пишем в начале предложения, когда говорим о предмете в первый раз. the - уточнение.