Some construction workers are taking a break.
A break has been called on the construction site.
Construction workers would only be taking a break if a break had been called.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_break(x3) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists e1 x1 x2 x3.(n_site(x2) & of(x2,x3) & n_construction(x3) & on(e1,x2) & Theme(e1,x1) & v_call(e1) & n_break(x1))