Английский язык. 3 класс. Помогите

There aren't two roses in the box.

2)There are two roses in the box. There aren't two roses in the box. The are two cocks in the box. 3)There is a lake behind the house. There isn't a lake behind the house. There is a tree behind the house. 4)There are three dogs near the lake. There aren't three dogs near the lake. There are three cats near the lake.