An unhappy looking child lays in the grass at a park.
A child is in the park alone and sad she has no friends.
An unhappy child at the park isn't necessarily alone.
exists e1 s1 x1 x2 x3 x4.(n_grass(x3) & a_topic(x1) & in(x1,x3) & at(x3,x4) & n_park(x4) & n_lay(x1) & of(x1,x2) & n_child(x2) & Actor(e1,x1) & v_look(e1) & a_unhappy(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_park(x2) & -exists e1 x3.(r_sad(e1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_friend(x3)) & n_female(x1) & in(x1,x2) & r_alone(x2) & n_child(x1))