A person on a surfboard with a paddle in a lake while two other people follow close behind in a boat.
Someone is using a paddle.
A "person" means that it is "someone" and being on a surfboard with a paddle implies that the person is using the paddle.
exists e1 p1 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10.(n_people(x8) & a_topic(x1) & on(x1,x2) & with(x2,x3) & in(x3,x4) & in(s1,x10) & n_boat(x10) & Theme(s1,x6) & Pivot(s1,x5) & a_behind(s1) & exists s2.(Theme(s2,x9) & a_close(s2)) & Recipient(e1,p1) & Actor(e1,x7) & Topic(e1,x9) & v_follow(e1) & (x6 = x9) & -(x7 = x8) & n_people(x7) & n_thing(x6) & card_eq_2(x6) & (x4 = x5) & n_lake(x4) & n_paddle(x3) & n_surfboard(x2) & n_person(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_use(e1) & n_paddle(x2) & n_person(x1))