A man and woman pose in front of some traffic.
An accident is causing heavy traffic.
A man and woman posing doesn't necessarily cause an accident or increase traffic.
exists e1 x1 x2 x3 x4 x5.(in(e1,x4) & of(x4,x5) & n_traffic(x5) & n_front(x4) & Actor(e1,x1) & v_pose(e1) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_cause(e1) & n_traffic(x2) & a_heavy(s1) & Theme(s1,x2) & n_accident(x1))