A man and young boy in a yellow life jacket are swimming.
A man and young boy are swimming to try to save themselve after a tidal wave hit their ship.
Swimming in a yellow life jacket does not imply that they were swimming to save themselves after their ship got hit by a tidal wave.
exists p1 s1 s2 x1 x2 x3 x4 x5.(exists x6.((x1 = x6) & n_swimming(x6)) & subset_of(x3,x1) & in(x3,x4) & n_jacket(x4) & of(x4,x5) & n_life(x5) & a_yellow(s2) & Theme(s2,x4) & n_boy(x3) & a_young(s1) & Theme(s1,x3) & subset_of(x2,x1) & n_man(x2))
exists e1 p1 s1 x1 x2 x3 x6.(Topic(e1,p1) & Actor(e1,x1) & v_swim(e1) & exists e2 p2.(Topic(e2,p2) & Actor(e2,x1) & v_try(e2) & exists e3 p3 x4.(exists e4 s2 x5.(Theme(e4,x6) & Actor(e4,x5) & v_hit(e4) & n_wave(x5) & a_tidal(s2) & Theme(s2,x5)) & after(e3,p3) & Theme(e3,x4) & Actor(e3,x1) & v_save(e3) & n_themselve(x4))) & n_ship(x6) & of(x6,x2) & n_thing(x2) & n_boy(x3) & a_young(s1) & Theme(s1,x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))