Several boys are playing football in the grass.
Boys are playing baseball
Boys cannot play baseball and football at the same time.
exists e1 s1 x1 x2 x3.(n_grass(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_football(x2) & n_boy(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_baseball(x2) & n_boy(x1))