A boy standing on a roof performing construction.
A young man works.
Performing construction implies work. A young man is the same as a boy.
exists e1 e2 x1 x2 x3 x4.(a_topic(x1) & for(e1,e2) & Theme(e2,x4) & Actor(e2,x2) & v_perform(e2) & n_construction(x4) & on(e1,x3) & n_roof(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_boy(x1))
exists s1 x1 x2.(a_topic(x1) & n_work(x1) & of(x1,x2) & n_man(x2) & a_young(s1) & Theme(s1,x1))