A young blond-haired boy is going down a red slide.
A young boy is playing in the sandbox.
One cannot play in a sandbox and go down a slide at the same time.
exists e1 s1 s2 s3 s4 x1 x2.(a_down(s4) & Manner(e1,s4) & Theme(e1,x2) & Actor(e1,x1) & v_go(e1) & n_slide(x2) & a_red(s3) & Theme(s3,x2) & n_boy(x1) & a_blond-haired(s2) & Theme(s2,x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_sandbox(x2) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))