Two men are lying on a roof doing work, while two other men are assisting using a lift.
Four men doing construction work.
Four men are doing work if two men are doing work and two other men are assisting.
exists e1 e2 p1 x1 x2 x3 x4.(exists e3 e4 x5 x6.(for(e3,e4) & Theme(e4,x6) & Actor(e4,x5) & v_use(e4) & n_lift(x6) & Actor(e3,x5) & v_assist(e3) & -(x5 = x1) & n_man(x5) & card_eq_2(x5)) & n_man(x1) & n_man(x1) & while(e1,p1) & on(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_do(e2) & n_work(x4) & (x2 = x3) & n_roof(x2) & Actor(e1,x1) & v_lie(e1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_work(x3) & of(x3,x4) & n_construction(x4) & (x1 = x2) & n_man(x1) & card_eq_4(x1))