A line of people wait to enter a building with a sign posted "Welcome Bikers."
The line of people are bikers.
Just because people wait to enter a building with a sign posted "Welcome Bikers" it does not mean they are bikers.
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e3 e2 x3 x4 x5 x6 x7.(with(e2,x4) & Theme(e3,x6) & Actor(e3,x5) & v_post(e3) & n_biker(x6) & of(x6,x7) & n_welcome(x7) & (x4 = x5) & n_sign(x4) & Theme(e2,x3) & Actor(e2,x1) & v_enter(e2) & n_building(x3)) & of(x1,x2) & n_people(x2) & n_line(x1))
exists p1 x1 x2.(n_line(x1) & exists x3.((x1 = x3) & n_biker(x3)) & of(x1,x2) & n_people(x2))