Question

make the sentences negative and interrogative

there is door behind the portrait

there`re three towers in the castle

Answer 1

сделать предложения отрицательными и вопросительными
есть дверь за портретом
там `повторно три башни в замке
 There is not door behind the portrait
 There are not three towers in the castle
 (Это отрицательные) 

Answer 2

negative

There is not a door behind the portrait.

There aren't three flowers in the castle.

interrogative

Is there a door behind the portrait? What is there behind the portrait?

Are there three flowers in the castle?How many flowers are there in the castle?