Some people walk past a large billboard.
Some people walk past a billboard advertising ice cream.
Just because Some people walk past a large billboard does not mean it is a billboard advertising ice cream.
exists e1 s1 x1 x2.(past(e1,x2) & n_billboard(x2) & a_large(s1) & Theme(s1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3 x4 x5.(past(e1,x2) & n_cream(x2) & of(x2,x5) & n_ice(x5) & of(x2,x4) & n_advertising(x4) & of(x2,x3) & n_billboard(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1))