a biker jumps over a pile of dirt.
The man is swimming in the ocean.
The actions and subject contradict each other. One cannot be swimming in the ocean while also jumping over dirt.
exists e1 x1 x2 x3.(over(e1,x2) & of(x2,x3) & n_dirt(x3) & n_pile(x2) & Actor(e1,x1) & v_jump(e1) & n_biker(x1))
exists e1 x1 x2.(n_ocean(x2) & n_man(x1) & in(e1,x2) & Actor(e1,x1) & v_swim(e1))