A stoplight is yellow next to a pedestrian crossing sign.
there are pedestrians present
There is a pedestrian crossing sign but this doesn't necessarily mean there are pedestrians at the sign.
exists e1 s1 x1 x2 x3.(to(s1,x2) & n_sign(x2) & Actor(e1,x2) & v_cross(e1) & of(x2,x3) & n_pedestrian(x3) & r_next(s1) & Theme(s1,x1) & a_yellow(s1) & n_stoplight(x1))
exists p1 x1 s1 x2 x3.((x1 = x2) & Theme(s1,x3) & a_present(s1) & (x2 = x3) & n_pedestrian(x2))