a young man skateboarding over a ramp behind a chain link fence with two friends.
A young man is swimming in the ocean.
One cannot be both skateboarding and swimming. Being over a ramp would imply he is on land, not in the ocean.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & over(e1,x3) & behind(x3,x4) & with(x4,x7) & n_friend(x7) & card_eq_2(x7) & Time(x4,x6) & n_fence(x6) & n_link(x4) & of(x4,x5) & n_chain(x5) & n_ramp(x3) & Actor(e1,x2) & v_skateboard(e1) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_ocean(x2) & in(e1,x2) & Actor(e1,x1) & v_swim(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))