A man supports a boy as he plays at a playground.
A man supports a boy on the slide on the playground
a man supporting a boy as he plays at playground doesn't imply that the boy was on the slide.
exists e1 p1 x1 x2.(exists e2 x3.(at(e2,x3) & n_playground(x3) & Actor(e2,x1) & v_play(e2)) & n_male(x1) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_support(e1) & n_boy(x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_playground(x4) & n_slide(x3) & Theme(e1,x2) & Actor(e1,x1) & v_support(e1) & on(x2,x3) & on(x3,x4) & n_boy(x2) & n_man(x1))