Man secures a large block of concrete.
A construction worker holds a large block of concrete.
The man does not necessarily need to be a construction worker. Securing a block of concrete does not necessitate that someone holds the concrete.
exists e1 s1 x1 x2 x3.(ne_nam_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_secure(e1) & of(x2,x3) & n_concrete(x3) & n_block(x2) & a_large(s1) & Theme(s1,x2))
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & of(x3,x4) & n_concrete(x4) & n_block(x3) & a_large(s1) & Theme(s1,x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))