1)There is somebody in the field - в поле кто то есть.
2)There was somebody in the field - в поле кто то был.
3)There will be somebody in the field - в поле кто то будет
4)There is somebody in the forest
5)There was somebody in the forest
6)There will be somebody in the forest
7)There is somebody in the house
8)There was somebody in the house
9)There will be somebody in the house
10)There is somebody in the stadium
11)There was somebody in the stadium
12)There will be somebody in the stadium
13)There is somebody in the swimming pool
14)There was somebody in the swimming pool
15)There will be somebody in the swimming pool