The man washes down the walkway.
A man washes the sidewalk.
Walkway is a synonym for sidewalk.
exists e1 s1 x1 x2.(n_walkway(x2) & n_man(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_wash(e1))
exists e1 x1 x2.(n_sidewalk(x2) & Theme(e1,x2) & Actor(e1,x1) & v_wash(e1) & n_man(x1))