Two men in protective gear are sawing through metal.
Two men are nailing boards together.
People sawing are not nailing.
exists e1 s1 x1 x2 x3.(through(e1,x3) & n_metal(x3) & Actor(e1,x1) & v_saw(e1) & in(x1,x2) & n_gear(x2) & a_protective(s1) & Theme(s1,x2) & n_man(x1) & card_eq_2(x1))
exists e1 p1 x1 x2.(exists s1.(Theme(s1,x2) & a_together(s1)) & Recipient(e1,p1) & Actor(e1,x1) & Topic(e1,x2) & v_nail(e1) & n_board(x2) & n_man(x1) & card_eq_2(x1))