A couple of workers on the grass with black tubing laying on the ground.
Construction workers prepare to install the drains.
Just because workers have black tubing does not mean they are construction workers or they are going to install the drains.
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_ground(x6) & n_grass(x3) & a_topic(x1) & on(e1,x6) & Actor(e1,x5) & v_lay(e1) & (x1 = x5) & with(x1,x4) & n_tubing(x4) & a_black(s1) & Theme(s1,x4) & on(x1,x3) & of(x1,x2) & n_worker(x2) & n_couple(x1))
exists e1 p1 x1 x2 x3.(n_drain(x3) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2.(Theme(e2,x3) & Actor(e2,x1) & v_install(e2)) & n_worker(x1) & of(x1,x2) & n_construction(x2))