Three workers are lifting a red sack while another sits on a floating dock.
The workers are undergoing a construction project.
Sentence one describes in detail some actions by workers that we can infer mean they are working on a construction project, such as lifting a red sack.
exists e1 p1 s1 x1 x2.(exists e2 s2 x3 x4.(on(e2,x4) & n_dock(x4) & a_floating(s2) & Theme(s2,x4) & Actor(e2,x3) & v_sit(e2) & n_thing(x3)) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_lift(e1) & n_sack(x2) & a_red(s1) & Theme(s1,x2) & n_worker(x1) & card_eq_3(x1))
exists e1 x1 x2 x3.(n_worker(x1) & Theme(e1,x2) & Actor(e1,x1) & v_undergo(e1) & n_project(x2) & of(x2,x3) & n_construction(x3))