A young boy jumping barefoot on a trampoline in his grassy backyard.
The backyard has no grass.
The backyard either has grass or no grass, but can't be both
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x5) & n_backyard(x5) & a_grassy(s2) & Theme(s2,x5) & of(x5,x1) & n_male(x1) & on(e1,x4) & n_trampoline(x4) & Theme(e1,x3) & Actor(e1,x2) & v_jump(e1) & n_barefoot(x3) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists x1.(n_backyard(x1) & -exists e1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_grass(x2)))