An unhappy looking child lays in the grass at a park.
A child cheerfully chases ducks in the park.
One can be cheerful or unhappy, not both simultaneously. One cannot lay in the grass while chasing ducks.
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 e1 s1 x1 x2 x3.(n_park(x3) & a_cheerfully(s1) & Manner(e1,s1) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_duck(x2) & n_child(x1))