Three people in bright green shirts work with trees.
The people are working.
If there are three people who work, it can be shortened to "people are working".
exists e1 s1 s2 x1 x2 x3.(with(e1,x3) & n_tree(x3) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_shirt(x2) & a_green(s2) & Theme(s2,x2) & a_bright(s1) & Theme(s1,x2) & n_people(x1) & card_eq_3(x1))
exists e1 x1.(n_people(x1) & Actor(e1,x1) & v_work(e1))