A guy is skateboarding down a road with a very green forest behind him.
A man bikes through a forest.
The man cannot be skateboarding and on a bike at the same time.
exists e1 s1 s2 x1 x2 x3.(with(e1,x3) & behind(x3,x1) & n_male(x1) & n_forest(x3) & a_green(s2) & Theme(s2,x3) & r_very(x3) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_skateboard(e1) & n_road(x2) & n_guy(x1))
exists x1 x2 x3.(a_topic(x1) & through(x1,x3) & n_forest(x3) & n_bike(x1) & of(x1,x2) & n_man(x2))