Shoppers walk past a line of motorcycles parked in front of a street market.
the cyclists are shopping
The sentence says the shoppers walked past motorcycles it does tell us anything about the cyclists.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(past(e1,x2) & of(x2,x3) & in(e2,x5) & of(x5,x6) & n_market(x6) & of(x6,x7) & n_street(x7) & n_front(x5) & Theme(e2,x4) & v_park(e2) & (x3 = x4) & n_motorcycle(x3) & n_line(x2) & Actor(e1,x1) & v_walk(e1) & n_shopper(x1))
exists p1 x1.(n_cyclist(x1) & exists x2.((x1 = x2) & n_shop(x2)))