A man on a motorcycle surrounded by white sand.
A man is riding a motorcycle outdoors.
The man would have to be on the motorcycle to ride it. The word sand makes you think of the beach and if he is at the beach he would have to be outside.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & Actor(e1,x4) & n_sand(x4) & a_white(s1) & Theme(s1,x4) & Theme(e1,x3) & v_surround(e1) & (x2 = x3) & n_motorcycle(x2) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_outdoors(x2) & of(x2,x3) & n_motorcycle(x3) & n_man(x1))