Two men in life jackets working on a jet ski while a small boy in a life jacket and a woman look on.
No one is doing anything mechanical.
Either two men are doing something or no one is doing anything.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13.(a_topic(x1) & in(x1,x2) & in(e1,x8) & subset_of(x11,x8) & Theme(s2,x13) & a_on(s2) & (x11 = x13) & n_look(x11) & of(x11,x12) & n_woman(x12) & subset_of(x9,x8) & n_jacket(x9) & of(x9,x10) & n_life(x10) & while(e1,x7) & n_boy(x7) & a_small(s1) & Theme(s1,x7) & on(e1,x5) & n_ski(x5) & of(x5,x6) & n_jet(x6) & Actor(e1,x4) & v_work(e1) & (x2 = x4) & n_jacket(x2) & of(x2,x3) & n_life(x3) & n_man(x1) & card_eq_2(x1))
-exists x1.(all x2.(n_thing(x2) -> exists e1 s1.(a_mechanical(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1))) & n_one(x1))