Children play soccer in a field.
The kids are playing on an artificial grass field.
We don't know if the grass on the field is real or artificial.
exists e1 x1 x2 x3.(in(e1,x3) & n_field(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_soccer(x2) & n_child(x1))
exists e1 s1 x1 x2 x3.(n_kid(x1) & on(e1,x2) & n_field(x2) & of(x2,x3) & n_grass(x3) & a_artificial(s1) & Theme(s1,x2) & Actor(e1,x1) & v_play(e1))