A group of workers are waiting to be picked up.
the workers waited
Workers waited is just a past tense of workers are waiting
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2 s1.(a_up(s1) & Manner(e2,s1) & Theme(e2,x1) & v_pick(e2)) & of(x1,x2) & n_worker(x2) & n_group(x1))
exists e1 x1.(n_worker(x1) & Actor(e1,x1) & v_wait(e1))