A man sketches a building covered in snow.
A man is working on an art piece.
When a man sketches a picture, it means he is working on an art piece .
exists e2 e1 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 x1 x2 x3.(on(e1,x2) & n_piece(x2) & of(x2,x3) & n_art(x3) & Actor(e1,x1) & v_work(e1) & n_man(x1))