Three little girls are sitting on the grass.
Three little girls are sitting on the grass having a picnic
Sitting in the grass does not imply having a picnic.
exists e1 s1 x1 x2.(n_grass(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & a_little(s1) & Theme(s1,x1) & card_eq_3(x1))
exists e1 e2 s1 x1 x2 x3.(n_grass(x2) & for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_have(e2) & n_picnic(x3) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_girl(x1) & a_little(s1) & Theme(s1,x1) & card_eq_3(x1))