A dirt biker in the forest.
A biker is sleeping in a tent
Sleeping cannot occur while riding a dirt bike.
exists x1 x2 x3.(n_forest(x3) & a_topic(x1) & in(x1,x3) & n_biker(x1) & of(x1,x2) & n_dirt(x2))
exists e1 x1 x2.(in(e1,x2) & n_tent(x2) & Actor(e1,x1) & v_sleep(e1) & n_biker(x1))