A man in a blue uniform holding a mop, and looking down at the floor.
the man is sweeping the stairs
The man is either sweeping or mopping but not both; also, he is either on a flat floor or on the stairs, but not both.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5 x6.(n_floor(x6) & a_down(s3) & Manner(e2,s3) & at(e2,x6) & Actor(e2,x4) & v_look(e2) & in(x4,x5) & n_uniform(x5) & a_blue(s2) & Theme(s2,x5) & n_man(x4) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_mop(x3) & in(x1,x2) & n_uniform(x2) & a_blue(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2.(n_stair(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_sweep(e1))