Английский язык. 3 класс. Помогите

2)There are two roses in the box.
There arent two roses in the box.
The are two cocks in the box.
3)There is a lake behind the house.
There isnt a lake behind the house.
There is a tree behind the house.
4)There are three dogs near the lake.
There arent three dogs near the lake.
There are three cats near the lake.

There arent two roses in the box.