A boy in a red shirt walking with American flags.
A boy is carrying a pink balloon.
If the boy is walking with American flags, he can't be carrying a pink balloon.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & with(e1,x4) & n_flag(x4) & a_american(s2) & Theme(s2,x4) & Actor(e1,x3) & v_walk(e1) & (x2 = x3) & n_shirt(x2) & a_red(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & n_balloon(x2) & a_pink(s1) & Theme(s1,x2) & n_boy(x1))