Two bikers are sitting and talking on a bench in front if their bikes.
Two bikers are near their bikes.
To be "in front if" something requires being near it.
exists e2 e1 x1 x2 x3 x4 x5.(in(e2,x4) & if(x4,x5) & n_bike(x5) & of(x5,x1) & n_thing(x1) & n_front(x4) & on(e2,x3) & n_bench(x3) & Actor(e2,x2) & v_talk(e2) & n_biker(x2) & card_eq_2(x2) & Actor(e1,x1) & v_sit(e1) & n_biker(x1) & card_eq_2(x1))
exists p1 x1 x2.(near(x1,x2) & n_bike(x2) & of(x2,x1) & n_thing(x1) & n_biker(x1) & card_eq_2(x1))