An older boy chases a laughing younger boy on the grass.
boys playing basketball
The boys cannot be playing basketball if one chases another
exists e1 e2 s1 s2 x1 x2 x3.(n_grass(x3) & Theme(e2,x2) & Actor(e2,x1) & v_chase(e2) & on(x2,x3) & n_boy(x2) & r_more(s2) & a_younger(s2) & Theme(s2,x2) & Actor(e1,x2) & v_laugh(e1) & n_boy(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_basketball(x1) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_boy(x2) & a_topic(x1))