A child in a red jacket, sitting atop a slide.
A child is sliding down a waterslide
One can't be sitting atop and be sliding down a slide at the same time.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & atop(e1,x4) & n_slide(x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_jacket(x2) & a_red(s1) & Theme(s1,x2) & n_child(x1))
exists e1 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1) & n_waterslide(x2) & n_child(x1))