A male sweeping the concrete.
The man is clearing the patio of grass trimmings.
Sweeping concrete does mean it is occurring on a patio, and many things can be swept away besides grass trimmings.
exists e1 x1 x2 x3.(n_concrete(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_sweep(e1) & (x1 = x2) & n_male(x1))
exists e1 x1 x2 x3 x4.(n_patio(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_clear(e1) & of(x2,x3) & n_trimming(x3) & of(x3,x4) & n_grass(x4))