A young man in a plaid shirts sits on the deck of a boat.
A young man is sitting on a boat.
He doesn't have to be sitting on the boat to be on the deck. He could be hanging off the side of the deck.
exists e1 s1 s2 x1 x2 x3 x4.(n_deck(x3) & on(e1,x3) & of(x3,x4) & n_boat(x4) & Actor(e1,x1) & v_sit(e1) & in(x1,x2) & n_shirt(x2) & a_plaid(s2) & Theme(s2,x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_boat(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))