A man walks near mountains.
A man driving a motorcycle.
The man is walking and not driving.
exists e1 x1 x2.(near(e1,x2) & n_mountain(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_drive(e1) & n_motorcycle(x3) & (x1 = x2) & n_man(x1))