dog jumping for Frisbee
A dog chases a squirrel up a tree.
A dog cannot be jumping for a Frisbee while it chases a squirrel.
exists e1 x1 x2 x3.(ne_org_frisbee(x3) & a_topic(x1) & for(e1,x3) & Actor(e1,x2) & v_jump(e1) & (x1 = x2) & n_dog(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & up(x2,x3) & n_tree(x3) & n_squirrel(x2) & n_dog(x1))