A man uses a hose to clean a plaza.
A groundskeeper is working.
A man using a hose to clean a plaza does not mean the man is a groundskeeper not that he is working.
exists e1 p1 x1 x2.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_clean(e2) & n_plaza(x3)) & n_hose(x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_work(e1) & n_groundskeeper(x1))