Several sports players do exercises on the field.
no one was on the field exercising
Several sports players were not on the field, exercising, according to the second sentence. First speaks of several while the second says no one.
exists e1 s1 x1 x2 x3 x4.(n_field(x4) & on(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_exercise(x3) & n_player(x1) & of(x1,x2) & n_sport(x2) & a_several(s1) & Theme(s1,x1))
exists x2.(n_field(x2) & -exists e1 p1 x1.(for(p1,e1) & Actor(e1,x1) & v_exercise(e1) & on(x1,x2) & n_one(x1)))