A man sketches a building covered in snow.
A man is staring at a blank page.
The page would not be blank if the man was sketching a building.
exists e1 e2 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_sketch(e2) & in(e1,x4) & n_snow(x4) & Theme(e1,x3) & v_cover(e1) & (x2 = x3) & n_building(x2) & n_man(x1))
exists e1 s1 x1 x2.(at(e1,x2) & n_page(x2) & a_blank(s1) & Theme(s1,x2) & Actor(e1,x1) & v_stare(e1) & n_man(x1))