Three people stand, ready to ski, next to a no skiing sign.
The sign is yellow.
A no skiing sign need not be yellow.
exists e1 p1 s1 x1.(for(e1,s1) & Topic(s1,p1) & Actor(s1,x1) & a_ready(s1) & exists e2.(-exists x2 x3 x4.(to(e2,x2) & Time(x2,x4) & n_a(x4) & n_sign(x2) & of(x2,x3) & n_skiing(x3)) & r_next(e2) & Actor(e2,x1) & v_ski(e2)) & Actor(e1,x1) & v_stand(e1) & n_people(x1) & card_eq_3(x1))
exists s1 x1.(n_sign(x1) & Theme(s1,x1) & a_yellow(s1))