A man power washes some steps beside a swimming pool.
A man is washing the steps outside.
Typically a power washer is used outside, so "power washes some  steps beside a swimming pool" implies the man does this outside.
exists e1 x1 x2 x3 x4 x5.(beside(e1,x4) & n_pool(x4) & of(x4,x5) & n_swimming(x5) & Theme(e1,x3) & Actor(e1,x1) & v_wash(e1) & n_step(x3) & n_power(x1) & of(x1,x2) & n_man(x2))
exists e1 s1 x1 x2.(n_step(x2) & a_outside(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_wash(e1) & n_man(x1))