A skier skis by a sign out in the mountains.
A skier misses a danger sign and crashes.
The skier misses the sign and crashed, therefore he couldn't be skiing by it.
exists x1 x2 x3 x4 x5.(n_mountain(x5) & a_topic(x1) & in(x4,x5) & out(x1,x4) & n_thing(x4) & by(x1,x3) & n_sign(x3) & n_ski(x1) & of(x1,x2) & n_skier(x2))
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x2) & Actor(e1,x1) & v_miss(e1) & subset_of(x5,x2) & n_crash(x5) & subset_of(x3,x2) & n_sign(x3) & of(x3,x4) & n_danger(x4) & n_skier(x1))