a dirt biker stands in the sunset.
A biker is standing.
The noun-verb combination "biker stands" is the same as "biker is standing," so the two sentences express the same idea.
exists e1 x1 x2 x3.(n_sunset(x3) & in(e1,x3) & Actor(e1,x1) & v_stand(e1) & n_biker(x1) & of(x1,x2) & n_dirt(x2))
exists e1 x1.(Actor(e1,x1) & v_stand(e1) & n_biker(x1))