I think the construction work is going on here.
Construction work is happening.
What is happening is what is going on.
exists e1 p1 x1 x2 x3.(n_work(x2) & of(x2,x3) & n_construction(x3) & n_person(x1) & exists e2 x4.(on(e2,x4) & n_here(x4) & Actor(e2,x2) & v_go(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_think(e1))
exists e1 x1 x2.(Actor(e1,x1) & v_happen(e1) & n_work(x1) & of(x1,x2) & n_construction(x2))