A man surfing in rough water
A man and his friend try new surfing tricks.
you can go surfing without trying new surfing tricks.
exists s1 x1 x2 x3.(a_topic(x1) & in(x1,x3) & n_water(x3) & a_rough(s1) & Theme(s1,x3) & n_surfing(x1) & of(x1,x2) & n_man(x2))
exists e1 s1 x1 x2 x3 x4 x5.(Theme(e1,x4) & Actor(e1,x1) & v_try(e1) & n_trick(x4) & of(x4,x5) & n_surfing(x5) & a_new(s1) & Theme(s1,x4) & subset_of(x3,x1) & n_friend(x3) & of(x3,x2) & n_male(x2) & subset_of(x2,x1) & n_man(x2))