The light could become a flying object in a wind storm.
the light will become a flying object if the storm happens.
Could does not necessarily mean will.
exists e1 p1 x1.(n_light(x1) & exists e3 e2 x2 x3 x4.(Theme(e3,x2) & Actor(e3,x1) & v_become(e3) & in(x2,x3) & n_storm(x3) & of(x3,x4) & n_wind(x4) & n_object(x2) & Actor(e2,x2) & v_fly(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_could(e1))
exists x1 x2.(n_light(x2) & n_storm(x1) & all e1.((Actor(e1,x1) & v_happen(e1)) -> exists e3 e2 x3.(Theme(e3,x3) & Actor(e3,x2) & v_become(e3) & n_object(x3) & Actor(e2,x3) & v_fly(e2))))