A boy in red jumps backward onto the sand at a playground.
A girl in blue is building a sand castle.
One cannot jump backward while building a sand castle.
exists s1 x1 x2 x3 x4.(n_sand(x3) & a_topic(x1) & in(x1,x2) & at(x2,x4) & n_playground(x4) & n_backward(x2) & onto(x2,x3) & n_jump(x2) & a_red(s1) & Theme(s1,x2) & n_boy(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_build(e1) & n_castle(x3) & of(x3,x4) & n_sand(x4) & in(x1,x2) & n_blue(x2) & n_girl(x1))