A group of people sits in the shade under a tree.
Some people are turning cartwheels in the grass of a park.
If people are doing cartwheels, they are not sitting.
exists e1 x1 x2 x3 x4.(n_shade(x3) & under(e1,x4) & n_tree(x4) & in(e1,x3) & Actor(e1,x1) & v_sit(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_grass(x3) & in(e1,x3) & of(x3,x4) & n_park(x4) & Theme(e1,x2) & Actor(e1,x1) & v_turn(e1) & n_cartwheel(x2) & n_people(x1))