Asian man sweeping the walkway.
A black man mowing the lawn
One cannot either be sweeping or mowing, but not both simultaneously.
exists e1 s1 x1 x2 x3.(n_walkway(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_sweep(e1) & (x1 = x2) & n_man(x1) & a_asian(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(n_lawn(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_mow(e1) & (x1 = x2) & n_man(x1) & a_black(s1) & Theme(s1,x1))