Construction workers have started to do work somewhere.
The workers were on break.
To work and to break are opposite activities.
exists e1 p1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_start(e1) & exists e2 x3 x4.(Location(e2,x4) & n_location(x4) & Theme(e2,x3) & Actor(e2,x1) & v_do(e2) & n_work(x3)) & n_worker(x1) & of(x1,x2) & n_construction(x2))
exists p1 x1.(n_worker(x1) & exists x2.(on(x1,x2) & n_break(x2)))