A family sitting on a picnic bench.
A family is having a picnic and it starts raining.
Just because a family is sitting on a picnic bench does not mean it starts to rain.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_bench(x3) & of(x3,x4) & n_picnic(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_family(x1))
exists e1 e2 p1 x1 x2.(exists e3.(Actor(e3,x1) & v_rain(e3)) & Topic(e2,p1) & Actor(e2,x1) & v_start(e2) & n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_picnic(x2) & n_family(x1))