A man snowboarding down a mountain.
The man is in a submarine.
A man cannot be snowboarding while on  a submarine.
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_snowboard(e1) & n_mountain(x3) & (x1 = x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2.(in(x1,x2) & n_submarine(x2)))