A heterosexual couple walk under an umbrella in the rain.
A couple walking under an umbrella in the rain are coming home from the movies.
A couple under a walk could be going anywhere and coming from anywhere, not just coming home from the movies.
exists s1 x1 x2 x3 x4.(n_rain(x4) & a_topic(x1) & under(x1,x3) & in(x3,x4) & n_umbrella(x3) & n_walk(x1) & of(x1,x2) & n_couple(x2) & a_heterosexual(s1) & Theme(s1,x1))
exists e1 e2 x1 x2 x3 x4 x5 x6.(n_movie(x6) & n_rain(x4) & from(e2,x6) & Time(e2,x5) & n_home(x5) & Actor(e2,x1) & v_come(e2) & in(e1,x4) & under(e1,x3) & n_umbrella(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_couple(x1))