A pair of office workers are diligently performing their tasks on messy desks.
Workers eating Pizza for celebration
Eating Pizza for celebration is something outside the usual office work and so the workers cannot be thought of as diligently performing their tasks.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_diligently(s2) & Manner(e1,s2) & on(e1,x5) & n_desk(x5) & a_messy(s1) & Theme(s1,x5) & Theme(e1,x4) & Actor(e1,x1) & v_perform(e1) & n_task(x4) & of(x4,x1) & n_thing(x1) & of(x1,x2) & n_worker(x2) & of(x2,x3) & n_office(x3) & n_pair(x1))
exists e1 x1 x2 x3 x4.(ne_org_pizza(x3) & a_topic(x1) & for(e1,x4) & n_celebration(x4) & Theme(e1,x3) & Actor(e1,x2) & v_eat(e1) & (x1 = x2) & n_worker(x1))