Two people performing an archaeological dig.
Some people are just watching.
Just because two people are performing an archaeological dig doesn't mean there are some people just watching. Both men could be working or one of them could be supervising.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_dig(x3) & a_archaeological(s1) & Theme(s1,x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 s1 x1.(a_just(s1) & Manner(e1,s1) & Actor(e1,x1) & v_watch(e1) & n_people(x1))