A little boy and a girl sitting down in the grass having fun.
Two children fighting over toys.
Two children do not have to be a little boy and a girl.  If a boy and girl are sitting down having fun they are not fighting over toys.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5.(n_grass(x4) & a_topic(s1) & subset_of(x2,s1) & for(e1,e2) & Theme(e2,x5) & Actor(e2,x3) & v_have(e2) & n_fun(x5) & in(e1,x4) & a_down(s3) & Manner(e1,s3) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_girl(x2) & subset_of(x1,s1) & n_boy(x1) & a_little(s2) & Theme(s2,x1))
exists e1 x1 x2 x3.(a_topic(x1) & over(e1,x3) & n_toy(x3) & Actor(e1,x2) & v_fight(e1) & (x1 = x2) & n_child(x1) & card_eq_2(x1))