The boy is coming down the amusement slide on his knees.
The boy is coming down the slide.
The boy is coming down the slide because he is coming down the slide on his knees.
exists e1 x1 x2 x3 x4.(n_knee(x4) & of(x4,x2) & n_male(x2) & n_slide(x2) & of(x2,x3) & n_amusement(x3) & n_boy(x1) & down(e1,x2) & on(x2,x4) & Actor(e1,x1) & v_come(e1))
exists e1 s1 x1 x2.(n_slide(x2) & n_boy(x1) & Time(e1,x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_come(e1))