A man climbs some rocks.
A mountain climber begins a climb
Not everyone who climbs rocks is a mountain climber.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_rock(x2) & n_man(x1))
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_begin(e1) & n_climb(x3) & n_climber(x1) & of(x1,x2) & n_mountain(x2))