A city worker diligently replacing some outdoor tiles.
A worker is busy.
Dilligently replacing does not necessarily mean busy.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & a_diligently(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_replace(e1) & n_tile(x4) & a_outdoor(s1) & Theme(s1,x4) & (x1 = x3) & n_worker(x1) & of(x1,x2) & n_city(x2))
exists s1 x1.(Theme(s1,x1) & a_busy(s1) & n_worker(x1))