A white man in a yellow and black sweatshirt grabs his snowboard while on a snowy hill.
A man grabs his surfboard on the beach.
A snowboard is not the same thing as a surfboard.   A snowy hill is a different location than a beach.
(x)
exists e1 x1 x2 x3.(n_beach(x3) & Theme(e1,x2) & Actor(e1,x1) & v_grab(e1) & on(x2,x3) & n_surfboard(x2) & of(x2,x1) & n_male(x1) & n_man(x1))